Implemented graph with nroer graph script
Merge pull request #181 from kedar2a/mongokit

Implemented graph with nroer graph script
Filtered graph to include only informative nodes.
Merge pull request #182 from kedar2a/mongokit

Filtered graph to include only informative nodes.
Position swapped between Tags and Privacy elements.
STATUS_CHOICES modified: status field is used for deleting (actually hiding from UI) node.
Url named as 'page_delete' added.
View named as 'delete_page' added.
Now a page-node can also be deleted but only by it's creator.