Removed unnecesary code from install.php controller
Transcoding & JSONP AJAX requests begins
Loading external CSS & JS, implemented changes needed for JSONP
Removed a blank line leftover
Removed proxy from php code and removed global define for apps base url
Merge pull request #121 from beat/feature-appstore-client

Feature appstore client: Removed client-local code, proxy, and going JSONP (includes latest from Ashwin)