sphinx documentation

[paulmueller]

I uploaded the documentation to the gh-pages branch.

There it is: http://cimatosa.github.io/jobmanager/

~~I also added everything you need to know to run and upload the documentation (automated script): https://github.com/cimatosa/jobmanager/tree/master/doc~~

The documentation is not finished yet. We need to unify style and add docs for undocumented methods. For example:

• add doc strings for each module
• use numpydoc-style documentation for all methods and classes

[paulmueller]

The documentation will now automatically be updated by travis when the sources are changed. Happy coding!