Added migrations to upgrade geonode from 1.2 to latest development version.
Added a migration for fetching initial GeoServer data in layer model.
Fixed a couple of backwards migrations.
Added some better comments.
Set the initial values for local (this fixes and closes #573 for existing layers.
We need to link the user to her/his account, as in 1.2 we did not use the account application.
Merge pull request #567 from capooti/capooti-dev

Added migrations to upgrade geonode from 1.2 to latest dev