Create docstrings on code and generate page with readthedocs using sphinx

[ryukinix]

Would be really cool a webpage for documentation like this http://python-packaging-user-guide.readthedocs.io/

Partially done on #25

• [x] docstrings
• [x] sphinx

[mparadinha]

Should we write a man page? I've been looking around on how to do it, and wouldn't mind doing it.

[ryukinix]

Would be great.

[ryukinix]

We need write better docstrings and setup the sphinx in a better way, but the initial work is done for know after #48