Adds search bar for adding thangs in level editor
Merge branch 'master' of https://github.com/jayant1992/codecombat into jayant1992-master

Conflicts:
	app/styles/editor/level/thangs_tab.sass
	app/templates/editor/level/thangs_tab.jade
	app/views/editor/level/thangs_tab_view.coffee
Fixed queue
Merge pull request #628 from codecombat/master

Quick queue fix