Update Waiting Room Split functionality

[sbsmith86]

Update the waiting room split functionality to work with the new DB structure, not sure how much of this needs to change, but this is a general outline of what should happen.

• There is one waiting room per contest.
• When the sign up period is over there is an option to split the room.
• The room gets split in to competitions.
• After split, the users get removed from that room and it can be reused if needed.

[itsjoekent]

I think this needs to be done #59 before I can do this, is someone already working on #59 ?