Migrate .on, .once - Batch 1
Migrate .on, .once - Fixed a small error
Fixed wrong migrations
More migrations
Refactored cast-button events
Reverted few wrong migrations
Merge branch 'migrateBBevents' of https://github.com/Shrihari/codecombat into Shrihari-migrateBBevents
Fixed destroy to not break stopListening, which uses off.
Merge branch 'master' of https://github.com/codecombat/codecombat