changes for join
merged branch into code

Conflicts:
	gnowsys-ndf/gnowsys_ndf/ndf/management/commands/filldb.py
	gnowsys-ndf/gnowsys_ndf/ndf/models.py
	gnowsys-ndf/gnowsys_ndf/ndf/templates/ndf/base.html
	gnowsys-ndf/gnowsys_ndf/ndf/templatetags/ndf_tags.py
	gnowsys-ndf/gnowsys_ndf/ndf/views/methods.py
changes
Added Group join - notification

Conflicts:
	gnowsys-ndf/gnowsys_ndf/ndf/management/commands/filldb.py
Merge pull request #46 from AvadootNachankar/mongokit

Two base templates (for edit/create and display) created for node's common fields
Merge branch 'mongokit' of https://github.com/gnowledge/gstudio into mongokit

Conflicts:
	gnowsys-ndf/gnowsys_ndf/ndf/templates/ndf/display_collection.html
	gnowsys-ndf/gnowsys_ndf/ndf/templatetags/ndf_tags.py
updated README.md
modified NUSSD -title with group name
Merge branch 'mongokit' of https://github.com/gnowledge/gstudio into mongokit
Merge pull request #48 from anujag/mongokit

Group title display -modified and INSTALL file modified
Heterogeneous collection implemented
Merge branch 'mongokit' of https://github.com/gnowledge/gstudio into mongokit
modification in video module
Merge branch 'mongokit' of github.com:gnowledge/gstudio into mongokit
Included Heterogeneous collection module
Few getter properties added that are used in node_details_base.html file.
Node fields replaced with their corresponding getter properties.
get_common_node_fields() function added that acts as a common method to save node's common fields.
Formatting changes.
Version-history part modified - Implemented Single-verssion and Compare-versions history view.