Replace deprecated functions ($.fn.load, $.fn.error, jqXHR.success & jqXHR.error)

As of jQuery 1.8, ```$.fn.load``` & ```$.fn.error``` have been deprecated, and cause an issue with the jQuery 2.0.0 upgrade. (http://api.jquery.com/error/)

Additionally, the ```jqXHR.success``` & ```jqXHR.error``` were deprecated in favor of the deferred ```.done``` & ```.fail```. (http://api.jquery.com/jQuery.ajax/)