Changing the repo to clone from the organisation GeoNode as we have now our own copy

Add SITEURL and CATALOGUE to local_settings.py.sample

Thanks @eomwandho 
looking forward for more contributions :)

Improve resourcebase style

Group button

Fixpip8

reverted changes

Following tips from http://boundlessgeo.com/whitepaper/geoserver-production-2/

Please note that this enforces a requirement of at least 2GB for Tomcat, which is in line with the 4GB minimum requirements specified in the documentation.

It is important to separate data and metadata. This way we will have one database for metadata (the django tables) called geonode, and another database for data (the imported vector data) called geonode_data and used by geoserver to serve the data.