Make the editor module compatible with browsers

[ymeine]

The backend contains two main parts (refer to the architecture description for more information):

• a core library/module, handling editor services
• a wrapper around this library, to provides those services through RPC, using a server

Needless to say that making the second part compatible with browsers makes no sense at all.

However, the editor should be available as browser-compatible module.

This way we would have two main benefits:

• browser compatibility, which means more efficiency for browser-based clients
• browser support, regarding developing tools, which are far better than nodejs' ones

To make that possible, several solutions exist, like browserify for instance.