post_node field added to Node class; and collection_set moved from GSystem to Node class.
Code added in order to add/update following fields: post_node and collection_set
Conflict resolved with commit #231
Merged #231 code with some changes
Merge branch 'mongokit' of https://github.com/gnowledge/gstudio into mongokit
Bug resolved: MetaType[0] changed to META_TYPE[0]
Updated get_gapps_menubar() function to display GAPPS in proper order.
Merge branch 'mongokit' of https://github.com/gnowledge/gstudio into mongokit
Merge pull request #233 from AvadootNachankar/mongokit

Adding fields "post_node" and "collection_set" to Node class