add game creation from model

Html side :
- add form with question, image chooser and model selection
- WIP : image upload (need server save), image gallery,

Server-side :
- Same operation as games for the models
- bit change with sending infos

Client-side :
- add first model, based on simpsons and daleks game : click-on-me
- models have different structures than games, they need to be generic
and so the define need to return a function, launched in the main.js

MORE info soon on the wiki !