Removed legacy cookiejar and its dependency json for ie6/7. Pretty sure everyone is on IE8 or better by now :) especially those that are using SB. Leaving jquery.cookie in for now as this is used for fallback if the browser doesn't have localStorage.
Remove unused js lib, jquery.expand was going to be used on the coming episodes revamp 2 years ago (build 482 time) but never was used.
Added CONTRIBUTING.md to help provide a guide on how to submit bugs/pull requests.