Upgrade jQuery

* Before moving Publisher to the admin gem, make sure everything works with the newest jQuery
* Also upgrade jQuery UI
* Fix uses of .attr() which has subtly changed between jQuery versions
* Javascript tested and reviewed:
  * Smart checkbox checking on business support pages
  * Sorting and auto slug generation on guides (some bugs found in original code, will address in separate PR)
  * Making changes to a form and being warned to save them
  * Bootstrap modals
  * Creating and editing smart answers/questions/outcomes