First stage of validation

u postman scheme has been updated
+ readme.txt about postman
+ validation for game bean
+ resolution field for game bean
+ validation for step bean
+ validation for user bean
+ getNull as JSON getter for password (hide password from everyone outside of system)
+ Validation in GameController
+ ExceptionHandler in GameController
+ 405 error page in RootController
+ validation in step controller
+ validation in user controller
+ validation in game dao
u constants have been injected in game dao
+ validation in step dao
+ validation in user dao
- setPassword(null) (see above)
+ Context static function getAuthLogin
+ Context.getAuthLogin has been injected in Game Service and User Service
+ validation for user service
u easy modification of test case