removed forgotten attribute gcc

Merge pull request #137 from pabloem/pycodestyle

Adding linter tests to continuous integration in Pykep

Merge pull request #122 from darioizzo/master

complex type changed in f2c and user classes

Merge pull request #121 from darioizzo/master

Docs Improved

version bump and candidate 2.4.1

Merge pull request #112 from darioizzo/pr/docs

docs improvements

Merge pull request #86 from darioizzo/master

Equinoctial elements work.

twine password update

Merge pull request #72 from darioizzo/master

2.1 tentative

Merge pull request #71 from darioizzo/master

pykep v 2.0