Merge branch 'master' of https://github.com/GeoNode/geonode
make location as default TopicCategory
Merge branch 'master' of https://github.com/GeoNode/geonode
Merge pull request #754 from simod/location-default

Make location as default TopicCategory
don't show download button if no layers available in batch
Merge branch 'master-search'
Merge branch 'master' of https://github.com/GeoNode/geonode
Merge branch 'master' of github.com:GeoNode/geonode into dev