Implemented socket.io rooms
* on clientReady, get all the clients connected to the main socket and
create a new room
* iterate through, if client id matches with readyClients array, make
client join room
* emit 'beginGame' to newly created room, kicking off client game init
* failing test for createRooms -- needs refactor
Fixed bug where multiple rooms weren't creating
* Empty the array of readyClients once a room is created