added CBUser and CBUserRobot
fixed chatview and default username
Merge branch 'master' of github.com:David402/chatgame
Merge branch 'master' into robot

Conflicts:
	chatgame.xcodeproj/project.pbxproj
Merge branch 'master' into robot
Merge branch 'robot'
fixed robots method
added robot
Merge branch 'robot'
fixed robot