Update play_view.coffee

Adding the "Find the Spy" level to the user created list.
Merge pull request #848 from gosnat/patch-1

Update play_view.coffee
Made spectate mode use top 20 players only
Fixed #772.
Merge branch 'master' of https://github.com/codecombat/codecombat
Trying synchronous spritesheet building during level loading for speed.
Merge pull request #849 from codecombat/master

Master into production