Public documentation - first stable version

[chucheria]

Use Sphinx with autodoc to automatically create documentation.

Public documentation only includes high-level classes, those designed as tasks or models.

The Makefile has been modified to include the install to modify docs and to build the html. The built has to be uploaded to the repository with the docs, no action to do this automatically has been added due to lack of permissions.

• make docs will setup and install all needed for writing docs.
• make html calls sphinx Makefile to build the HTML.

[nimbusaeta]

Looks good! As discussed, I added 2 commits to fix the problems we saw.

[nimbusaeta]

I added some commits editing the texts to include the last edition to the readme file.

[nimbusaeta]

The last 2 commits have been added to show Classes in the main page and the navigation bar.