New bookmarklet, various other changes including a gh-pages branch.

Made the css file into a bookmarklet which can then be triggered easily on any page (except ssl pages, currently).  Had to make a gh-pages branch and site to be able to host the css since the server returning mimetype text seemed to break the bookmarklet's functionality (though you can host raw js via the repositories if you want, just not css apparently).

Instructions for just keeping the master and gh-pages branches in sync are here (this is recommended for simplicity):
http://brettterpstra.com/2012/09/26/github-tip-easily-sync-your-master-to-github-pages/

Also merged the readme into a README.markdown file to let markdown work.