Removal of git implementation and Updated benchmarker module.

1. benchmarker views.py file updated according to modified models.

2. settings.py updated : Settings related to git modified to RCS.

3. ndf model file updated.
  
    - GSystem collection : 
          'attribute_set': [dict],		# modified from->  'attribute_set': dict
          'relation_set': [dict],		# modified from->  'relation_set': dict

    - RelationType collection : (following two fields added)
          'subject_type': [ObjectId],	       # ObjectId's of GSystemType Class
          'object_type': [ObjectId],	       # ObjectId's of GSystemType Class                 

    - HistoryManager collection : Removed due to git issues.