If a revision was specified, show the updated date for that revision Else show the updated date for the notebook only used if the "updated" code is triggered closes #208
If a revision was specified, show the updated date for that revision
Else show the updated date for the notebook
only used if the "updated" code is triggered
closes #208

nbgallery/nbgallery,nbgallery/nbgallery,nbgallery/nbgallery,nbgallery/nbgallery