Merge pull request #1 from codecombat/master

test request
Fix for #506
Hide arrow's shadow if buried
Merge remote-tracking branch 'upstream/master'
hide spear's shadow if buried
hide Arrow and Spear if buried use ['Arrow', 'Spear'] for condition
Migrate from .on, .once to .listenTo, .listenToOnce
Updates fb and g+ functions to be called on api load, fixes #695
Added infinite loop handling to Simulator.
Merge branch 'master' of https://github.com/codecombat/codecombat
Merge pull request #687 from kgy01/master

Hide arrow's shadow if buried
Merge branch 'master' of https://github.com/codecombat/codecombat
Removed some unnecessary callbacks.
Merge branch 'master' of https://github.com/jayant1992/codecombat into jayant1992-master
"Merge branch 'master' of https://github.com/codecombat/codecombat
Simulator handles more errors.
Fix for infinite loop fix.
Got the gplus friends loading now.
Added a google plus connect button.
Sorted the friend sessions a bit.