Nereid Product Catalog Tree #3273

* Added models for node, product-node, website, website-node
* Added render method to node
* Added views and urls
* Added tests

Review-ID: 1183001
Project-ID: 989
Task-ID: 3273
Merge pull request #1 from uditagarwal/develop

Nereid Product Catalog Tree #3273
Add MANIFEST.in
Bump version to 3.0.1.0
Merge branch 'release/3.0.1.0'