Merged Chrome Extension CSS changes into Safari Extension codebase

I merged the various changes into the Safari Extension's CSS that have occurred with the Chrome Extension over time. I built the extension locally (using my personal certificate) and tested it on OS X 10.9.2 with Safari 7.0.2. All looks good to me -- though as I'm sure you know this type of CSS modification extension is hard to regression test. Anyway, though this might help speed up the process of getting an updated Safari extension out to folks.