Merge pull request #668 from AvadootNachankar/mongokit

Access rights modified regarding subscribing users/admins of a group (by it's group-admin)
Bug resolved while selecting multiple elements with ctrl key in collection widget
minor changes in script for saving the drawer2 elements
Bug resolved while saving the collection, with selection & unselection procedure of elements in drawers
print & commented statements removed
Merge pull request #669 from sunnychaudhari/mongokit

Minor changes while saving collection
Agency type added to group and author class
Merge branch 'mongokit' of https://github.com/gnowledge/gstudio into mongokit
group modified with agency_type
Merge pull request #670 from anujag/mongokit

Agency type added to group and author classes
MetaStudio's icon link (Broken link rectified)
Restricting MIS, MIS-PO and Batch GAPP's access to only gstaff members (superuser, creator and admin of the group)
Work regarding MIS template redesigning.
Renamed add_fields_to_existing_documents to sync_existing_documents