Merge pull request #830 from gintau/feature/loading-views

Merge master to Feature/loading views
Fixed some things that were keeping brunch from working.
Added a line for testing the loading system.
Merge branch 'feature/loading-views' of https://github.com/codecombat/codecombat into feature/loading-views
Handler for test.
Merge branch 'feature/loading-views' of https://github.com/codecombat/codecombat into feature/loading-views

Conflicts:
	server/commons/Handler.coffee
debugging: ladder_view doesn't show loading bar.
Fix loading bar and retry block in ladder_view, #857.