Current work for the tournament feature
Fixed entities
Action to view list of tournaments 
New abstract base class for all tournaments (leagues and tournaments).
Renamed Tournament to League and TournamentTournament to Tournament.
Adding tournaments implemented
Fixed unique name validation for tournaments and leagues
Renamed TournamentController to TournamentSetupController 
Display a tournament
Fixed link to tournament
Fußi can now start and display tournaments
Fixed tests
It's now possible to view the match form for a planned tournament match.
Save and show match results
Basic tournaments are now working
Tournaments and Leagues are handled with one single action in the tournament controller
Display tournaments on dashboard
Finished single elimination tournament mode
Unit tests added
Code cleanup