Heterogeneous collection implemented
Merge branch 'mongokit' of https://github.com/gnowledge/gstudio into mongokit
Included Heterogeneous collection module
delete implemented in file
merge confilict resolve after dhiru's commit
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.
Merge pull request #50 from sunnychaudhari/mongokit

Included Heterogeneous collection module
Merged Heterogenous collections part.
Merge branch 'mongokit' of https://github.com/gnowledge/gstudio into mongokit
group_set field added in GSystem class.
Listing & editing of Pages based on group selection.
delete implemented for file,image,video
Merge branch 'mongokit' of https://github.com/gnowledge/gstudio into mongokit
Implemented delete remove bug for already uploaded files
conflict resolved after avdoot's commimits
changes in url of images link