Add matches API.
Add sport to sample set and seeds
Add Coup du monde (Kin-Ball) as sample set.
Fix typo in data set
Add LeagueThreeTeam  match generator
Merge remote-tracking branch 'origin/master' into live_api
Merge remote-tracking branch 'origin/master' into live_api
Merge remote-tracking branch 'origin/master' into live_api
Refactor API to use ActiveModelSerializers for Live-Data. Add new stages for leagues (which Kin-Ball uses). Fix some bugs.
Add Final Stage and Seeding. Add Results to Matches. Kin-Ball-Workflow complete.
Merge branch 'live_api' into scheduling

Conflicts:
	app/models/match.rb
	app/workers/generate_groups_worker.rb
Merge branch 'live_api' into scheduling

Conflicts:
	db/schema.rb
	spec/factories/league_final_stages.rb
	spec/factories/league_round_stages.rb