View the file you're editing in Emacs on GitHub.
Available as a package in Marmalade and MELPA.
M-x package-install github-browse-file
You can change some defaults using M-x customize-group github-browse-file
Call github-browse-file (for the git blob) or github-browse-file-blame
(for the git blame) to view current file on GitHub. With a prefix argument
(C-u), you can force them to use the "master" branch.
github-browse-commit can be used to link to the current commit.