PlayRoute.model() doesn't need testing

Especially since injecting the store into the route seems to be really
complicated. It's tested indirectly by acceptance tests anyway.
Change fixme to todo
Change fixme to todo
Unit-testing PlayReadRoute's willTransition action is not feasable
Change fixmes into wontfixes
Change fixme to todo
Typos
Change fixmes to todos
Add controller:play test
Add controller:play test
Add controller:play/read _startCountdown test
Also test setCountdown duration inside _startCountdown
Remove useless get
Add test for controller:play/read _updateCountdown()
Add controller:play/read _cancelCountdown test
Fix scale in previous test and add _setCountdown test
Add tests on timer durations, change some code style
Add test for controller:play/read _reschedule()
Remove useless fixme
Classify todos and fixmes