Fix an issue with capitalization and Chrome headers being lowercase. Also put a 'var' where one was needed. This should fix everybody's issue of Clockwork not working in the latest Chrome.
Changed it so that it's compatible regardless of which case Chrome returns the headers in.
Merge branch 'master' of git://github.com/EvanDarwin/clockwork-chrome into EvanDarwin-master

Conflicts:
	Clockwork Chrome/assets/javascripts/panel.js
	Clockwork Chrome/manifest.json
Merge branch 'EvanDarwin-master'
Bumped version to 1.4.3, updated changelog.