fix sortable timing bug regarding editable activation

https://www.pivotaltracker.com/story/show/56802896

still not psyched about this fix... it might be worth PRing an event back into the aloha core that is thrown after the sortable is created. 

the real problem that kathi was experiencing was that some of the elements were committed back into the repo with the ui-sortable class on them. committing that class should be impossible now as it has been added to ephemera but just to support the dirty content i changed the conditional to check the object data instead of the class