Revert "Merge pull request #113 from atom/bo-highlights"

This reverts commit 2972c136d2de97727f7ba0b357da0b3e59e59347, reversing
changes made to 6884ea28d0b3ed8f575f573c989f93a996c32b45.

Conflicts:
	lib/extension-helper.coffee
	lib/renderer.coffee