Merge branch 'develop' into feature/match
Add json_response helper to ActionController::TestCase
Get host id from object instead of column
Move Devise mappings to base test case
Prefer &&/|| over and/or

https://github.com/bbatsov/ruby-style-guide
Add API methods for getting and updating a match
Resolve pools when generating matches
Remove support for double round-robin tournaments
Do not allow starting a tournament with an odd number of participants
Rename tournament codes back
Move helper methods to model
Add round prefix to each pool
Merge branch 'feature/match' into develop