Removal of git implementation and Updated benchmarker module.

[kedar2a]

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.