Fix Timestamp publish issue #3721

* Added function field publish_date in article model.
* Replaced published_on with publish_date in tree view.
Merge pull request #34 from tarunbhardwaj/task-3721

Fix Timestamp publish issue #3721
Added classmethod on get_publish_date
Merge pull request #35 from tarunbhardwaj/task-3721

Added classmethod on get_publish_date
Added static folder to nereid website #3565

* Added view also
* Webhandler to upload and list files from cms_static folder.

Review ID: 2013001
Fixed pagination url for article categories #3755
Merge pull request #37 from tarunbhardwaj/task-3685

Added static folder to nereid website #3565
Merge pull request #36 from tarunbhardwaj/task-3755

Fixed pagination url for article categories #3755