Merge pull request #10 from kedar2a/mongokit

Implemented orgitdown editor interface for wikipage
ProcessType, MetaType added
Merge pull request #11 from anujag/mongokit

ProcessType , MetaType added and GSystemtype modified
Group and File classes created
Merge pull request #12 from anujag/mongokit

Group and File classes created
File class modified to inherit from GSystem
Merge pull request #14 from anujag/mongokit

File class modified to inherit from GSystem
Updated models.py file with gnowledge model file update