enforces competition join uniqueness on the server
fiddling
implements leave and remove user from competitons
fixes current user and fixes serving up ember app
still attempting to fix comp join and comp create
merged in master
add check to add add exercise for null
fix test
updates isJoined
change color of leave button
adds client and server validations for max number of players
add cucumber for max players
Merge pull request #6 from CerebralStorm/limit_comp_users

Limit comp users
adds back application current user
add test to edit user settings
fix comp join validation when competition is nil
Merge pull request #5 from CerebralStorm/comp_join

Comp join