Merge pull request #1 from Modified/master

Just cleanups, merged with "final" (hackathon pitch) version.
content_script.js: lots of tweaks and cleanups and lots of "FIXME" (tho I use "???") comments on stuff that, well, smells.
Our JS needs _serious_ refactoring.
(Hey, maybe convert it to CoffeeScript while at it? See http://js2coffee.org/ ;o)