Edit/Delete measures through admin measures page

This updates the Thorax admin measure view to support editing/deleting measures in a more consistent manner.

For deleting, it uses Thorax's promises. jQuery has been updated to 1.9.1, as there was a [bug](http://bugs.jquery.com/ticket/13292) where jQuery didn't correctly handle a 204 response, which is what our API returns.

For editing, it uses Thorax's [serialize](http://thoraxjs.org/api.html#serialize) instead of [FormData](https://developer.mozilla.org/en-US/docs/Web/API/FormData), which doesn't work with our target browser.