MIS updated template & script to set-up default GAPPS for college group(s)


**Functionalities implemented:**

1) **Script updated to set-up default GAPPS for college & other group(s) wherever required**
 
   - Option implemented to set-up GAPPs for college group(s) [-g/--setup-gapps]
   
   - File modified:
   
     1) management/commands/mis_college_group.py

2) **Bug fixes**
 
   - Files modified:
   
     1) models.py

        - Was getting following error while running mis_college_script script:
   
          - Error: ObjectId("...") is not JSON serializable!!
          
        - To resolve this, 'cls=NodeJsonEncoder' added in function call to json.dumps() within create_or_replace_json_file() of HistoryManager class
     
     2) templates/ndf/edit_group.html
     
        - blocktrans syntax updated
       
     3) templates/ndf/person_create_edit.html
     
        - blocktrans syntax updated
       
     4) templates/ndf/student_create_edit.html
     
        - Column-wise tabbing changed to row-wise tabbing