Delete UserModelTest since we're changing the way the user is handled
Delete all user related files in planning poker
Delete more user files
Add all of the classes for the new user model (currently empty) that we will be using from now forward.
Add UserModel, User, AddUserRequestObserver, and AddUserController

Other bits of the user still need to be implemented
Merge pull request #266 from sfmailand/sbl-dev

Add user model