Started migrating to CoffeeScript.

* Raw JavaScript is shit, even with jQuery, so mostly everything is
getting ported to CoffeeScript.
* Readme updated with build info.
* Minimum Chrome version has been bumped to 22 for future use of the
alarms API.
* new Libs folder in the Scripts directory to hold scripts that aren't
directly related to the popup or settings pages.
* Python build script added to compile the CoffeeScript files to JS.
* AppSettings and LocalSettings are the first victims of the porting
process, as they needed to be redone first so they weren't such a
dysfunctional mess.
* Made the string formatter a bit more lax.
* For now, WIC has been demoted from being an "always-on" background
extension. Might be re-enabled in the future.