Removed all the extra useless font inlcudes

Chrome only uses .woff in the extension anyway, including other formats for alternative browser compatibility in a chrome specific extension is pointless, I'll delete all the other ../font files as well
Note: I kept the .foundicon-plus in case you would like to use the plus sign on http://zurb.com/playground/foundation-icons for the add speed dial button instead of /images/add.png in the future.