Classes Added/Updated and Bug resolved regarding user-dashboard


Files modified:

1) models.py
   - New classes added listed as following:
     1) Triple
     2) GAttribute
     3) GRelation
     
   - Changes in GSystem class:
     1) relation_set field
         - Data-type changed from [dict] to [ObjectId]
         - This ObjectId is an instance of GRelations collection
         - Idea is to store relation_type ObjectId, subject_value ObjectId and object_value ObjectId in GRelation instance first, and then append this ObjectId of GRelation instance in respective subject and object Nodes' relation_set field.
          
     2) attribute_set field
         - Currently commented this field, don't REMOVE!!
        
        
2) userDashboard.html
   - Bug resolved: Group-id passed as parameter in 'getImageThumbnail' and 'submitDoc' urls.