shelf code added
alerts placed for shelf_item add and shelf_item removed
Merge branch 'mongokit' of https://github.com/gnowledge/gstudio into collection
Shelf block added
'shelf_allowed' tag added to allow the shelf items to be added in user shelf
template for displaying shelves and shelf items
code added for allowing node to add as a shelf item in user shelf
code added for deleting shelves and shelf items
Merge pull request #783 from sunnychaudhari/collection

Shelf is activated now