Separate modules into their own .jade

         Text Chat
         local Camera
         user List
Replace modules by their include into room.jade
Send modules list from backend to frontend
Modules now initilized from the list given in the constrution of src/room.coffee
Remove a useless function in frontend/room.coffee
Retrieve modules' HTML.
UserList and textChat are full modules now
fixes #11 modularize Camera.

           Also fix bugs because the initialization of
            the network manager was done too late.