#33 load front-end dependencies from CDN

The following libraries were removed from the repo, and will now be hosted on a CDN:
* jquery
* jqueryui
* jquery easing plugin
* jquery mousewheel plugin
* modernizr
* normalize

index.php - changed src location of aforementioned scripts/stylesheets to point to a CDN. also moved the scripts to the end of body to improve initial load time.