Extract duplicate code into BaseWorker class.
Tweak views a bit, add convenience methods.
Fix some stuff on Scheduler to make it more flexibile.
Fix style violations.
Merge pull request #42 from elisapp/scheduling_fixes

Scheduling fixes
Use real data for Referee API.
Fix generation of game times in league_stage for scheduling. Prepare Kin-Ball data set for usage times on courts. Add courts from data sets.
Fix style violations and specs
Add push notification registration API endpoint.
Merge pull request #44 from elisapp/notifications_api

Push Notification Registrations API
Add prepare to elimination stage, Add results input for dodgeball
Fix spacing of result edit form
Splite group/match generation, add elimination seed