Import KMZ into GeoNode

[ScottEvil]

As a user I need to be able to import a KMZ file into GeoNode so that I publish data I have in this format.

[ ] Import UI for GeoNode supports KMZ as a format
[ ] Supported KML are imported
[ ] Unsupported KML formats inform user of any error returned from importer
[ ] File successfully imports into GeoServer data store
[ ] Layer is published in GeoServer and GeoNode