Mapping

- µCtrl's model update
- Model can emit events on save and destroy
- Mapping from and to NinjaBlock
- Crawler (fetchAll and pushAll)
- Some tests have been done.
- Need to create tests files with Mocha...
- Steps to fetch all the data : 
- Create an user with the userAccessToken (POST : http://localhost:3000/users). It will retrieve all your infos and give you an µCtrl token.
- Fetch all the data : (GET : http://localhost:3000/users/:µCtrl_Token)
As this is users.js, I would have expected this `fetchAll` function to fetch all USERS. Not all the system with the crawler. I think this should be somewhere else.