Add docs skeleton with autogenerated module docs

[vladcalin]

I generated the default docs structure using sphinx and added auto-generated docs for modules.

I though that the project needs at least the following sections:

• installation guide
• some examples of basic usage that will help new users to get a quick grasp of what this library is capable of
• some pointers on how to extend certain features, such as creating a new loader
• contribute - a guide for wanna be contributors (how to create pull requests, how to create an issue, etc). This can import from CONTRIBUTING.rst from the root of the project.
• Module reference - api documentation based on docstrings.

[coveralls]

Coverage remained the same at 81.306% when pulling 2a703bf on vladcalin:add-docs into 161d101 on rochacbruno:master.

[vladcalin]

Hey @rochacbruno can you look over this? It's staying open for quite some time now. The Travis check is failing from some pep8 issues in the code and has nothing to do with the changes from this PR.