Implemented relaying of updated user ranking to all users
Implemented relaying of updated total coins to a particular user
Added user status (in challenge room), implemented auto-update of challenge status
Added endpoint for cancelling challenge invitation
Added validation in challenge controller
Added socket close handler for users currently in challenge room
Added endpoint for getting user's current battle
Added endpoint for getting user's current challenge
Reused user service for getting current challenges in socket disconnect module
Implemented sending of challenge details to challenger
Merge branch 'master' of https://github.com/ericapadilla/testRepo