Moved South to latest version.
refactor and fix the permissions management
Resetting migrations from 2.0 tagged version.
Added a development roadmap info.

This fixes https://github.com/GeoNode/geonode/issues/1148
Merge pull request #1443 from markiliffe/master

Added a development roadmap info.
Merge branch 'master' of https://github.com/GeoNode/geonode into api
distinct objects and add search tests