Use Restangular instead of $http and $ngResource for Games and Players resource

On master, we use both $http and $ngResource for calling the Babitch API.

This PR change all that for using Restangular, which is much better than both of those old solutions.
* it uses promises
* do not need to know urls of the rest api
* it is much more futurproof (it let create our own method if needed)
* it will simplify the Admin section (CRUD) of the player resources.

WYT ?