Case sensitive room names

[gmittal]

Found a bug where the room names on the iOS client are case sensitive, meaning that 'yabaiyo' and 'YABAIYO' create two separate rooms. Try and eliminate that (should be simple with a simple to-uppercase method that's probably already built into Objective-C). I've set it up on the web client so that 'yabaiyo' or even 'YaBaiyo' get changed to 'YABAIYO' to create one uniform room. I suggest that you guys do the same on the iOS client.