Implemented check for "Make_Module" & changes done in models.py

Implemented check for "Make_Module":
  for this created one AttributeType called "module_set_md5" and stored each module_set_fields's  md5 in that    GAtrribute. and checking has been done according to md5 on each creation of module.

Note:Run>> python manage.py filldb to create AttributeType "module_set_md5"

Changes in models.py
changed collection_name of Triple class from "Triples" to "Nodes"
and added _type field in Triple class
renamed "subject_value" to "subject" in Triple class