Completely switch to OSGi

Oyé! Oyé! Here it is!
The OSGified Roboconf. Alleluia! :100: 

Beyond all the OSGi soup, we now have integration tests and a manual deployment was succesfully tested on EC2. All the other cloud targets will have to be checked.

This PR solves a LOT of issues and will allow us to resume some works that were in stand-by.