Merge pull request #777 from sunnychaudhari/collection

links other than 'About' & 'Contanct' are disabled
data-review: method added to take action on edit
img/ added to gitignore (img folder contains NROER images)
Merge pull request #779 from kedar2a/mongokit

img/ added to gitignore and little modifications in data-review
Specify django version in requirements.txt (issue #778)
Merge pull request #780 from m-anish/patch-1

Specify django version in requirements.txt (issue #778)
shelf code added
alerts placed for shelf_item add and shelf_item removed