Update jQuery to 1.11.1 for Vellum

This includes updating jquery-ui to 1.11.2

@biyeun please review. I'm thinking this may be too invasive on other pages (I didn't test it anywhere except the form designer page). Therefore it might not be the best approach. Unfortunately the form designer page depends on a very deep template hierarchy and I'm not sure how else to do it. Suggestions are welcome.