Bracket

Progress in tournament functionality: bracket and group stage pairing
- Models for Tournament, TournPair, TournUser, TournDeck
- instance methods in Tournament: initiate_bracket, initiate_groups(int)
       *tests for these methods in tournament spec
- basic views for testing tournament creation and bracket viewing
Prefer `detect` over `find`.<br>Line is too long. [104/80]<br>Surrounding space missing for operator '*'.