diff --git a/.travis.yml b/.travis.yml
index f590ef22c6f21..5d533c70f6b5b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -59,9 +59,9 @@ matrix:
        before_install: sudo apt-get install -yqq libatlas3gf-base libatlas-dev
 
 
-install: source continuous_integration/install.sh
-script: bash continuous_integration/test_script.sh
-after_success: source continuous_integration/after_success.sh
+install: source build_tools/travis/install.sh
+script: bash build_tools/travis/test_script.sh
+after_success: source build_tools/travis/after_success.sh
 notifications:
   webhooks:
     urls:
diff --git a/appveyor.yml b/appveyor.yml
index 05390a515461d..205018f166bf6 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -7,7 +7,7 @@ environment:
     # SDK v7.0 MSVC Express 2008's SetEnv.cmd script will fail if the
     # /E:ON and /V:ON options are not enabled in the batch script interpreter
     # See: http://stackoverflow.com/a/13751649/163740
-    CMD_IN_ENV: "cmd /E:ON /V:ON /C .\\continuous_integration\\appveyor\\run_with_env.cmd"
+    CMD_IN_ENV: "cmd /E:ON /V:ON /C .\\build_tools\\appveyor\\run_with_env.cmd"
     WHEELHOUSE_UPLOADER_USERNAME: sklearn-appveyor
     WHEELHOUSE_UPLOADER_SECRET:
       secure: BQm8KfEj6v2Y+dQxb2syQvTFxDnHXvaNktkLcYSq7jfbTOO6eH9n09tfQzFUVcWZ
@@ -38,7 +38,7 @@ environment:
 install:
   # Install Python (from the official .msi of http://python.org) and pip when
   # not already installed.
-  - "powershell ./continuous_integration/appveyor/install.ps1"
+  - "powershell ./build_tools/appveyor/install.ps1"
   - "SET PATH=%PYTHON%;%PYTHON%\\Scripts;%PATH%"
   - "python -m pip install -U pip"
 
@@ -48,7 +48,7 @@ install:
   - "pip --version"
 
   # Install the build and runtime dependencies of the project.
-  - "%CMD_IN_ENV% pip install --timeout=60 --trusted-host 28daf2247a33ed269873-7b1aad3fab3cc330e1fd9d109892382a.r6.cf2.rackcdn.com -r continuous_integration/appveyor/requirements.txt"
+  - "%CMD_IN_ENV% pip install --timeout=60 --trusted-host 28daf2247a33ed269873-7b1aad3fab3cc330e1fd9d109892382a.r6.cf2.rackcdn.com -r build_tools/appveyor/requirements.txt"
   - "%CMD_IN_ENV% python setup.py bdist_wheel bdist_wininst -b doc/logos/scikit-learn-logo.bmp"
   - ps: "ls dist"
 
diff --git a/continuous_integration/appveyor/install.ps1 b/build_tools/appveyor/install.ps1
similarity index 100%
rename from continuous_integration/appveyor/install.ps1
rename to build_tools/appveyor/install.ps1
diff --git a/continuous_integration/appveyor/requirements.txt b/build_tools/appveyor/requirements.txt
similarity index 100%
rename from continuous_integration/appveyor/requirements.txt
rename to build_tools/appveyor/requirements.txt
diff --git a/continuous_integration/appveyor/run_with_env.cmd b/build_tools/appveyor/run_with_env.cmd
similarity index 100%
rename from continuous_integration/appveyor/run_with_env.cmd
rename to build_tools/appveyor/run_with_env.cmd
diff --git a/continuous_integration/circle/build_doc.sh b/build_tools/circle/build_doc.sh
similarity index 96%
rename from continuous_integration/circle/build_doc.sh
rename to build_tools/circle/build_doc.sh
index da84ecd3b8b5f..bde8539c8058e 100755
--- a/continuous_integration/circle/build_doc.sh
+++ b/build_tools/circle/build_doc.sh
@@ -5,7 +5,7 @@ set -e
 # documentation: a pull request that does not change any file in doc/ or
 # examples/ folder should be skipped unless the "[doc: build]" is found the
 # commit message.
-BUILD_DOC=`python continuous_integration/circle/check_build_doc.py`
+BUILD_DOC=`python build_tools/circle/check_build_doc.py`
 echo -e $BUILD_DOC
 if [[ $BUILD_DOC == "SKIP:"* ]]; then
     touch ~/log.txt  # the "test" segment needs that file
diff --git a/continuous_integration/circle/check_build_doc.py b/build_tools/circle/check_build_doc.py
similarity index 100%
rename from continuous_integration/circle/check_build_doc.py
rename to build_tools/circle/check_build_doc.py
diff --git a/continuous_integration/circle/push_doc.sh b/build_tools/circle/push_doc.sh
similarity index 100%
rename from continuous_integration/circle/push_doc.sh
rename to build_tools/circle/push_doc.sh
diff --git a/sklearn/_build_utils/cythonize.py b/build_tools/cythonize.py
similarity index 100%
rename from sklearn/_build_utils/cythonize.py
rename to build_tools/cythonize.py
diff --git a/continuous_integration/after_success.sh b/build_tools/travis/after_success.sh
similarity index 100%
rename from continuous_integration/after_success.sh
rename to build_tools/travis/after_success.sh
diff --git a/continuous_integration/install.sh b/build_tools/travis/install.sh
similarity index 100%
rename from continuous_integration/install.sh
rename to build_tools/travis/install.sh
diff --git a/continuous_integration/test_script.sh b/build_tools/travis/test_script.sh
similarity index 100%
rename from continuous_integration/test_script.sh
rename to build_tools/travis/test_script.sh
diff --git a/continuous_integration/windows/windows_testing_downloader.ps1 b/build_tools/windows/windows_testing_downloader.ps1
similarity index 97%
rename from continuous_integration/windows/windows_testing_downloader.ps1
rename to build_tools/windows/windows_testing_downloader.ps1
index bb9cc5a44e85b..d72b6786ee504 100644
--- a/continuous_integration/windows/windows_testing_downloader.ps1
+++ b/build_tools/windows/windows_testing_downloader.ps1
@@ -1,270 +1,270 @@
-# Author: Kyle Kastner <kastnerkyle@gmail.com>
-# License: BSD 3 clause
-
-# This script is a helper to download the base python, numpy, and scipy
-# packages from their respective websites.
-# To quickly execute the script, run the following Powershell command:
-# powershell.exe -ExecutionPolicy unrestricted "iex ((new-object net.webclient).DownloadString('https://raw.githubusercontent.com/scikit-learn/scikit-learn/master/continuous_integration/windows/windows_testing_downloader.ps1'))"
-
-# This is a stopgap solution to make Windows testing easier
-# until Windows CI issues are resolved.
-
-# Rackspace's default Windows VMs have several security features enabled by default.
-# The DisableInternetExplorerESC function disables a feature which
-# prevents any webpage from opening without explicit permission.
-# This is a default setting of Windows VMs on Rackspace, and makes it annoying to
-# download other packages to test!
-
-# Powershell scripts are also disabled by default. One must run the command:
-# set-executionpolicy unrestricted
-# from a Powershell terminal with administrator rights to enable scripts.
-# To start an administrator Powershell terminal, right click second icon from the left on Windows Server 2012's bottom taskbar.
-
-param (
-    [string]$python = "None",
-    [string]$nogit = "False"
-)
-
-function DisableInternetExplorerESC {
-    # Disables InternetExplorerESC to enable easier manual downloads of testing packages.
-    # http://stackoverflow.com/questions/9368305/disable-ie-security-on-windows-server-via-powershell
-    $AdminKey = "HKLM:\SOFTWARE\Microsoft\Active Setup\Installed Components\{A509B1A7-37EF-4b3f-8CFC-4F3A74704073}"
-    $UserKey = "HKLM:\SOFTWARE\Microsoft\Active Setup\Installed Components\{A509B1A8-37EF-4b3f-8CFC-4F3A74704073}"
-    Set-ItemProperty -Path $AdminKey -Name "IsInstalled" -Value 0
-    Set-ItemProperty -Path $UserKey -Name "IsInstalled" -Value 0
-    Stop-Process -Name Explorer
-    Write-Host "IE Enhanced Security Configuration (ESC) has been disabled." -ForegroundColor Green
-}
-
-function DownloadPackages ($package_dict, $append_string) {
-    $webclient = New-Object System.Net.WebClient
-
-    ForEach ($key in $package_dict.Keys) {
-        $url = $package_dict[$key]
-        $file = $key + $append_string
-        if ($url -match "(\.*exe$)") {
-            $file = $file + ".exe"
-        } elseif ($url -match "(\.*msi$)") {
-            $file = $file + ".msi"
-        } else {
-            $file = $file + ".py"
-        }
-        $basedir = $pwd.Path + "\"
-        $filepath = $basedir + $file
-        Write-Host "Downloading" $file "from" $url
-
-        # Retry up to 5 times in case of network transient errors.
-        $retry_attempts = 5
-        for($i=0; $i -lt $retry_attempts; $i++){
-             try{
-                  $webclient.DownloadFile($url, $filepath)
-                  break
-             }
-             Catch [Exception]{
-                  Start-Sleep 1
-             }
-        }
-        Write-Host "File saved at" $filepath
-    }
-}
-
-function InstallPython($match_string) {
-    $pkg_regex = "python" + $match_string + "*"
-    $pkg = Get-ChildItem -Filter $pkg_regex -Name
-    Invoke-Expression -Command "msiexec /qn /i $pkg"
-    
-    Write-Host "Installing Python"
-    Start-Sleep 25
-    Write-Host "Python installation complete"
-}
-
-function InstallPip($match_string, $python_version) {
-    $pkg_regex = "get-pip" + $match_string + "*"
-    $py = $python_version -replace "\."
-    $pkg = Get-ChildItem -Filter $pkg_regex -Name
-    $python_path = "C:\Python" + $py + "\python.exe"
-    Invoke-Expression -Command "$python_path $pkg"
-}
-
-function EnsurePip($python_version) {
-    $py = $python_version -replace "\."
-    $python_path = "C:\Python" + $py + "\python.exe"
-    Invoke-Expression -Command "$python_path -m ensurepip"
-}
-
-function GetPythonHome($python_version) {
-    $py = $python_version -replace "\."
-    $pypath = "C:\Python" + $py + "\"
-    return $pypath
-}
-
-function GetPipPath($python_version) {
-    $py = $python_version -replace "\."
-    $pypath = GetPythonHome $python_version
-    if ($py.StartsWith("3")) {
-        $pip = $pypath + "Scripts\pip3.exe"
-    } else {
-        $pip = $pypath + "Scripts\pip.exe"
-    }
-    return $pip
-}
-
-function PipInstall($pkg_name, $python_version, $extra_args) {
-    $pip = GetPipPath $python_version
-    Invoke-Expression -Command "$pip install $pkg_name"
-}
-
-function InstallNose($python_version) {
-    PipInstall "nose" $python_version 
-}
-
-function WheelInstall($name, $url, $python_version) {
-    $pip = GetPipPath $python_version
-    $args = "install --use-wheel --no-index"
-    Invoke-Expression -Command "$pip $args $url $name"
-}
-
-function InstallWheel($python_version) {
-    PipInstall "virtualenv" $python_version
-    PipInstall "wheel" $python_version
-}
-
-function InstallNumpy($package_dict, $python_version) {
-    #Don't pass name so we can use URL directly.
-    WheelInstall "" $package_dict["numpy"] $python_version
-}
-
-function InstallScipy($package_dict, $python_version) {
-    #Don't pass name so we can use URL directly.
-    WheelInstall "" $package_dict["scipy"] $python_version
-}
-
-function InstallGit {
-    $pkg_regex = "git*"
-    $pkg = Get-ChildItem -Filter $pkg_regex -Name
-    $pkg_cmd = $pwd.ToString() + "\" + $pkg + " /verysilent"
-    Invoke-Expression -Command $pkg_cmd
-    
-    Write-Host "Installing Git"
-    Start-Sleep 20 
-    # Remove the installer - seems to cause weird issues with Git Bash
-    Invoke-Expression -Command "rm git.exe"
-    Write-Host "Git installation complete"
-}
-
-function ReadAndUpdateFromRegistry {
-    # http://stackoverflow.com/questions/14381650/how-to-update-windows-powershell-session-environment-variables-from-registry
-    foreach($level in "Machine","User") {
-    [Environment]::GetEnvironmentVariables($level).GetEnumerator() | % {
-       # For Path variables, append the new values, if they're not already in there
-       if($_.Name -match 'Path$') { 
-          $_.Value = ($((Get-Content "Env:$($_.Name)") + ";$($_.Value)") -split ';' | Select -unique) -join ';'
-       }
-       $_
-       } | Set-Content -Path { "Env:$($_.Name)" }
-    }
-}
-
-function UpdatePaths($python_version) {
-    #This function makes local path updates required in order to install Python and supplementary packages in a single shell.
-    $pypath = GetPythonHome $python_version
-    $env:PATH = $env:PATH + ";" + $pypath
-    $env:PYTHONPATH = $pypath + "DLLs;" + $pypath + "Lib;" + $pypath + "Lib\site-packages"
-    $env:PYTHONHOME = $pypath
-    Write-Host "PYTHONHOME temporarily set to" $env:PYTHONHOME
-    Write-Host "PYTHONPATH temporarily set to" $env:PYTHONPATH
-    Write-Host "PATH temporarily set to" $env:PATH
-}
-
-function Python27URLs {
-    # Function returns a dictionary of packages to download for Python 2.7.
-    $urls = @{
-        "python" = "https://www.python.org/ftp/python/2.7.7/python-2.7.7.msi"
-        "numpy" = "http://28daf2247a33ed269873-7b1aad3fab3cc330e1fd9d109892382a.r6.cf2.rackcdn.com/numpy-1.8.1-cp27-none-win32.whl"
-        "scipy" = "http://28daf2247a33ed269873-7b1aad3fab3cc330e1fd9d109892382a.r6.cf2.rackcdn.com/scipy-0.14.0-cp27-none-win32.whl"
-        "get-pip" = "https://bootstrap.pypa.io/get-pip.py"
-    }
-    return $urls    
-}
-
-function Python34URLs {
-    # Function returns a dictionary of packages to download for Python 3.4.
-    $urls = @{
-        "python" = "https://www.python.org/ftp/python/3.4.1/python-3.4.1.msi"
-        "numpy" = "http://28daf2247a33ed269873-7b1aad3fab3cc330e1fd9d109892382a.r6.cf2.rackcdn.com/numpy-1.8.1-cp34-none-win32.whl"
-        "scipy" = "http://28daf2247a33ed269873-7b1aad3fab3cc330e1fd9d109892382a.r6.cf2.rackcdn.com/scipy-0.14.0-cp34-none-win32.whl"
-    }
-    return $urls    
-}
-
-function GitURLs {
-    # Function returns a dictionary of packages to download for Git
-    $urls = @{
-        "git" = "https://github.com/msysgit/msysgit/releases/download/Git-1.9.4-preview20140611/Git-1.9.4-preview20140611.exe"
-    }
-    return $urls    
-}
-
-function main {
-    $versions = @{
-        "2.7" = Python27URLs
-        "3.4" = Python34URLs
-    }
-
-    if ($nogit -eq "False") {
-        Write-Host "Downloading and installing Gitbash"
-        $urls = GitURLs
-        DownloadPackages $urls ""
-        InstallGit ".exe"
-    }
-
-    if (($python -eq "None")) {
-        Write-Host "Installing all supported python versions"
-        Write-Host "Current versions supported are:"
-        ForEach ($key in $versions.Keys) {
-            Write-Host $key
-            $all_python += @($key)
-        }
-    } elseif(!($versions.ContainsKey($python))) {
-        Write-Host "Python version not recognized!"
-        Write-Host "Pass python version with -python"
-        Write-Host "Current versions supported are:"
-        ForEach ($key in $versions.Keys) {
-            Write-Host $key
-        }
-        return
-    } else {
-        $all_python += @($python)
-    }
-    ForEach ($py in $all_python) {
-        Write-Host "Installing Python" $py
-        DisableInternetExplorerESC
-        $pystring = $py -replace "\."
-        $pystring = "_py" + $pystring
-        $package_dict = $versions[$py]
-
-        # This will download the whl packages as well which is
-        # clunky but makes configuration simpler.
-        DownloadPackages $package_dict $pystring
-        UpdatePaths $py
-        InstallPython $pystring
-        ReadAndUpdateFromRegistry
-        if ($package_dict.ContainsKey("get-pip")) {
-           InstallPip $pystring $py
-        } else {
-           EnsurePip $py 
-        }
-        InstallNose $py
-        InstallWheel $py
-
-        # The installers below here use wheel packages.
-        # Wheels were created from CGohlke's installers with
-        # wheel convert <exefile>
-        # These are hosted in Rackspace Cloud Files.
-        InstallNumpy $package_dict $py
-        InstallScipy $package_dict $py
-    }
-    return
-}
-
-main
+# Author: Kyle Kastner <kastnerkyle@gmail.com>
+# License: BSD 3 clause
+
+# This script is a helper to download the base python, numpy, and scipy
+# packages from their respective websites.
+# To quickly execute the script, run the following Powershell command:
+# powershell.exe -ExecutionPolicy unrestricted "iex ((new-object net.webclient).DownloadString('https://raw.githubusercontent.com/scikit-learn/scikit-learn/master/continuous_integration/windows/windows_testing_downloader.ps1'))"
+
+# This is a stopgap solution to make Windows testing easier
+# until Windows CI issues are resolved.
+
+# Rackspace's default Windows VMs have several security features enabled by default.
+# The DisableInternetExplorerESC function disables a feature which
+# prevents any webpage from opening without explicit permission.
+# This is a default setting of Windows VMs on Rackspace, and makes it annoying to
+# download other packages to test!
+
+# Powershell scripts are also disabled by default. One must run the command:
+# set-executionpolicy unrestricted
+# from a Powershell terminal with administrator rights to enable scripts.
+# To start an administrator Powershell terminal, right click second icon from the left on Windows Server 2012's bottom taskbar.
+
+param (
+    [string]$python = "None",
+    [string]$nogit = "False"
+)
+
+function DisableInternetExplorerESC {
+    # Disables InternetExplorerESC to enable easier manual downloads of testing packages.
+    # http://stackoverflow.com/questions/9368305/disable-ie-security-on-windows-server-via-powershell
+    $AdminKey = "HKLM:\SOFTWARE\Microsoft\Active Setup\Installed Components\{A509B1A7-37EF-4b3f-8CFC-4F3A74704073}"
+    $UserKey = "HKLM:\SOFTWARE\Microsoft\Active Setup\Installed Components\{A509B1A8-37EF-4b3f-8CFC-4F3A74704073}"
+    Set-ItemProperty -Path $AdminKey -Name "IsInstalled" -Value 0
+    Set-ItemProperty -Path $UserKey -Name "IsInstalled" -Value 0
+    Stop-Process -Name Explorer
+    Write-Host "IE Enhanced Security Configuration (ESC) has been disabled." -ForegroundColor Green
+}
+
+function DownloadPackages ($package_dict, $append_string) {
+    $webclient = New-Object System.Net.WebClient
+
+    ForEach ($key in $package_dict.Keys) {
+        $url = $package_dict[$key]
+        $file = $key + $append_string
+        if ($url -match "(\.*exe$)") {
+            $file = $file + ".exe"
+        } elseif ($url -match "(\.*msi$)") {
+            $file = $file + ".msi"
+        } else {
+            $file = $file + ".py"
+        }
+        $basedir = $pwd.Path + "\"
+        $filepath = $basedir + $file
+        Write-Host "Downloading" $file "from" $url
+
+        # Retry up to 5 times in case of network transient errors.
+        $retry_attempts = 5
+        for($i=0; $i -lt $retry_attempts; $i++){
+             try{
+                  $webclient.DownloadFile($url, $filepath)
+                  break
+             }
+             Catch [Exception]{
+                  Start-Sleep 1
+             }
+        }
+        Write-Host "File saved at" $filepath
+    }
+}
+
+function InstallPython($match_string) {
+    $pkg_regex = "python" + $match_string + "*"
+    $pkg = Get-ChildItem -Filter $pkg_regex -Name
+    Invoke-Expression -Command "msiexec /qn /i $pkg"
+    
+    Write-Host "Installing Python"
+    Start-Sleep 25
+    Write-Host "Python installation complete"
+}
+
+function InstallPip($match_string, $python_version) {
+    $pkg_regex = "get-pip" + $match_string + "*"
+    $py = $python_version -replace "\."
+    $pkg = Get-ChildItem -Filter $pkg_regex -Name
+    $python_path = "C:\Python" + $py + "\python.exe"
+    Invoke-Expression -Command "$python_path $pkg"
+}
+
+function EnsurePip($python_version) {
+    $py = $python_version -replace "\."
+    $python_path = "C:\Python" + $py + "\python.exe"
+    Invoke-Expression -Command "$python_path -m ensurepip"
+}
+
+function GetPythonHome($python_version) {
+    $py = $python_version -replace "\."
+    $pypath = "C:\Python" + $py + "\"
+    return $pypath
+}
+
+function GetPipPath($python_version) {
+    $py = $python_version -replace "\."
+    $pypath = GetPythonHome $python_version
+    if ($py.StartsWith("3")) {
+        $pip = $pypath + "Scripts\pip3.exe"
+    } else {
+        $pip = $pypath + "Scripts\pip.exe"
+    }
+    return $pip
+}
+
+function PipInstall($pkg_name, $python_version, $extra_args) {
+    $pip = GetPipPath $python_version
+    Invoke-Expression -Command "$pip install $pkg_name"
+}
+
+function InstallNose($python_version) {
+    PipInstall "nose" $python_version 
+}
+
+function WheelInstall($name, $url, $python_version) {
+    $pip = GetPipPath $python_version
+    $args = "install --use-wheel --no-index"
+    Invoke-Expression -Command "$pip $args $url $name"
+}
+
+function InstallWheel($python_version) {
+    PipInstall "virtualenv" $python_version
+    PipInstall "wheel" $python_version
+}
+
+function InstallNumpy($package_dict, $python_version) {
+    #Don't pass name so we can use URL directly.
+    WheelInstall "" $package_dict["numpy"] $python_version
+}
+
+function InstallScipy($package_dict, $python_version) {
+    #Don't pass name so we can use URL directly.
+    WheelInstall "" $package_dict["scipy"] $python_version
+}
+
+function InstallGit {
+    $pkg_regex = "git*"
+    $pkg = Get-ChildItem -Filter $pkg_regex -Name
+    $pkg_cmd = $pwd.ToString() + "\" + $pkg + " /verysilent"
+    Invoke-Expression -Command $pkg_cmd
+    
+    Write-Host "Installing Git"
+    Start-Sleep 20 
+    # Remove the installer - seems to cause weird issues with Git Bash
+    Invoke-Expression -Command "rm git.exe"
+    Write-Host "Git installation complete"
+}
+
+function ReadAndUpdateFromRegistry {
+    # http://stackoverflow.com/questions/14381650/how-to-update-windows-powershell-session-environment-variables-from-registry
+    foreach($level in "Machine","User") {
+    [Environment]::GetEnvironmentVariables($level).GetEnumerator() | % {
+       # For Path variables, append the new values, if they're not already in there
+       if($_.Name -match 'Path$') { 
+          $_.Value = ($((Get-Content "Env:$($_.Name)") + ";$($_.Value)") -split ';' | Select -unique) -join ';'
+       }
+       $_
+       } | Set-Content -Path { "Env:$($_.Name)" }
+    }
+}
+
+function UpdatePaths($python_version) {
+    #This function makes local path updates required in order to install Python and supplementary packages in a single shell.
+    $pypath = GetPythonHome $python_version
+    $env:PATH = $env:PATH + ";" + $pypath
+    $env:PYTHONPATH = $pypath + "DLLs;" + $pypath + "Lib;" + $pypath + "Lib\site-packages"
+    $env:PYTHONHOME = $pypath
+    Write-Host "PYTHONHOME temporarily set to" $env:PYTHONHOME
+    Write-Host "PYTHONPATH temporarily set to" $env:PYTHONPATH
+    Write-Host "PATH temporarily set to" $env:PATH
+}
+
+function Python27URLs {
+    # Function returns a dictionary of packages to download for Python 2.7.
+    $urls = @{
+        "python" = "https://www.python.org/ftp/python/2.7.7/python-2.7.7.msi"
+        "numpy" = "http://28daf2247a33ed269873-7b1aad3fab3cc330e1fd9d109892382a.r6.cf2.rackcdn.com/numpy-1.8.1-cp27-none-win32.whl"
+        "scipy" = "http://28daf2247a33ed269873-7b1aad3fab3cc330e1fd9d109892382a.r6.cf2.rackcdn.com/scipy-0.14.0-cp27-none-win32.whl"
+        "get-pip" = "https://bootstrap.pypa.io/get-pip.py"
+    }
+    return $urls    
+}
+
+function Python34URLs {
+    # Function returns a dictionary of packages to download for Python 3.4.
+    $urls = @{
+        "python" = "https://www.python.org/ftp/python/3.4.1/python-3.4.1.msi"
+        "numpy" = "http://28daf2247a33ed269873-7b1aad3fab3cc330e1fd9d109892382a.r6.cf2.rackcdn.com/numpy-1.8.1-cp34-none-win32.whl"
+        "scipy" = "http://28daf2247a33ed269873-7b1aad3fab3cc330e1fd9d109892382a.r6.cf2.rackcdn.com/scipy-0.14.0-cp34-none-win32.whl"
+    }
+    return $urls    
+}
+
+function GitURLs {
+    # Function returns a dictionary of packages to download for Git
+    $urls = @{
+        "git" = "https://github.com/msysgit/msysgit/releases/download/Git-1.9.4-preview20140611/Git-1.9.4-preview20140611.exe"
+    }
+    return $urls    
+}
+
+function main {
+    $versions = @{
+        "2.7" = Python27URLs
+        "3.4" = Python34URLs
+    }
+
+    if ($nogit -eq "False") {
+        Write-Host "Downloading and installing Gitbash"
+        $urls = GitURLs
+        DownloadPackages $urls ""
+        InstallGit ".exe"
+    }
+
+    if (($python -eq "None")) {
+        Write-Host "Installing all supported python versions"
+        Write-Host "Current versions supported are:"
+        ForEach ($key in $versions.Keys) {
+            Write-Host $key
+            $all_python += @($key)
+        }
+    } elseif(!($versions.ContainsKey($python))) {
+        Write-Host "Python version not recognized!"
+        Write-Host "Pass python version with -python"
+        Write-Host "Current versions supported are:"
+        ForEach ($key in $versions.Keys) {
+            Write-Host $key
+        }
+        return
+    } else {
+        $all_python += @($python)
+    }
+    ForEach ($py in $all_python) {
+        Write-Host "Installing Python" $py
+        DisableInternetExplorerESC
+        $pystring = $py -replace "\."
+        $pystring = "_py" + $pystring
+        $package_dict = $versions[$py]
+
+        # This will download the whl packages as well which is
+        # clunky but makes configuration simpler.
+        DownloadPackages $package_dict $pystring
+        UpdatePaths $py
+        InstallPython $pystring
+        ReadAndUpdateFromRegistry
+        if ($package_dict.ContainsKey("get-pip")) {
+           InstallPip $pystring $py
+        } else {
+           EnsurePip $py 
+        }
+        InstallNose $py
+        InstallWheel $py
+
+        # The installers below here use wheel packages.
+        # Wheels were created from CGohlke's installers with
+        # wheel convert <exefile>
+        # These are hosted in Rackspace Cloud Files.
+        InstallNumpy $package_dict $py
+        InstallScipy $package_dict $py
+    }
+    return
+}
+
+main
diff --git a/circle.yml b/circle.yml
index dff2b533a5344..dd26453fa2e9c 100644
--- a/circle.yml
+++ b/circle.yml
@@ -6,7 +6,7 @@ dependencies:
   # Check whether the doc build is required, install build dependencies and
   # run sphinx to build the doc.
   override:
-    - ./continuous_integration/circle/build_doc.sh
+    - ./build_tools/circle/build_doc.sh
 test:
   # Grep error on the documentation
   override:
@@ -15,7 +15,7 @@ deployment:
  push:
    branch: master
    commands:
-     - bash continuous_integration/circle/push_doc.sh
+     - bash build_tools/circle/push_doc.sh
 general:
   # Open the doc to the API
   artifacts:
diff --git a/setup.py b/setup.py
index 3f4f2aa121d99..ba5b3d31be756 100755
--- a/setup.py
+++ b/setup.py
@@ -176,8 +176,9 @@ def get_numpy_status():
 def generate_cython():
     cwd = os.path.abspath(os.path.dirname(__file__))
     print("Cythonizing sources")
-    p = subprocess.call([sys.executable, os.path.join(cwd, 'sklearn',
-                                        '_build_utils', 'cythonize.py'),
+    p = subprocess.call([sys.executable, os.path.join(cwd,
+                                                      'build_tools',
+                                                      'cythonize.py'),
                          'sklearn'],
                         cwd=cwd)
     if p != 0:
diff --git a/sklearn/_build_utils/__init__.py b/sklearn/_build_utils/__init__.py
index 25c33d6809145..85049f7492621 100644
--- a/sklearn/_build_utils/__init__.py
+++ b/sklearn/_build_utils/__init__.py
@@ -6,15 +6,8 @@
 
 from __future__ import division, print_function, absolute_import
 
-HASH_FILE = 'cythonize.dat'
 DEFAULT_ROOT = 'sklearn'
 
-# WindowsError is not defined on unix systems
-try:
-    WindowsError
-except NameError:
-    WindowsError = None
-
 from numpy.distutils.system_info import get_info