Fixed the styling for the loading gif:

 - centered the animated gif and the text
 - put a border around the whole loading box
 - added some padding between and around the items
Updste jQuery and added autosized accordion items:

 - Updated jQuery and jQuery UI to the latest stable versions:
 -- This adds the support for the auto-sized filter accordion items
 -- This removed the double scrollbar that occurred for large facets
 -- Makes the expanding more natural
 - Added jQuery Migrate to be used when testing - pick up any incompatibilities
 - Made the accordion items in the left filter size to its contents