showing edit button and derive a copy link in published content that the user owns
moving session.get('id') into template helper function, deleting unneccesary ajax call, setting canPublish in model.
listening for change:canPublish on views instead of synchronous ajax call
removing commented code
removing reference to jquery, removing user variable
removing session as a parameter in canEdit, referencing session.get('id') in the method itself,adding session dependency to node.coffee
Merge pull request #762 from Connexions/editing-and-deriving-published-content

Allow owners to edit published content