Start new class for server side.
Adding lint for client in gulp
Basic sketch of the application.

This tries using Traceur to compile ES6 code but this does not look
perfect.
Merge remote-tracking branch 'remotes/origin/topic/ebaucheServeur' into topic/client
merge with server
Jsx compilation in gulp
Add watcher for jsx files
Adding browserify + first elements
Build process documentation
Basic cases drawing
Merge client with develop (gulpfile modified)
Fix gulpfile + new docs for build process
Define basic connexion to the server.
Add players notification when a new player enters.
Merge branch 'doc_connexion' into develop

* doc_connexion:
  Add players notification when a new player enters.
  Define basic connexion to the server.
Change some build message.
Correctly order phases in watch.
Code connection of client to the server.
Create a binary to start server.
Create a new player on connection.