Updates jeditable to use blank defaults for WYSIWYG
Bugfixes, tweaks to in-place editing

The controller change fixes a double-render error which I think was the cause of both [#59878460] and [#58756184] (duplicates, I think).

https://www.pivotaltracker.com/story/show/58756184
https://www.pivotaltracker.com/story/show/59878460