added database class
Added mongodb implementation
Added redis implementation
Update of redis and mongo connectors to singleton classes.
Fix some bugs on the connectors.
Starting of RestApi removal
Replacement of REST API done from quickLogin to the room
beginning of fixing problem with websocket server but not resolved
[database] do not generate ids inside main voicious code (but inside db drivers if we have to)
[database] update mongo driver
[database] update redis server
[database] fix error in ws server (access to id instead of _id)
[database] remove deprecated code (REST API) and useless requires
[database] update dependencies in package.json
[database] improve database connection error management
[database] remove old models
Merge pull request #55 from Paulloz/database

Refactor all database accesses, fixes #21