Continued work on making the importer based uploader work with time and geogit datastores

Not quite finished with this, but figured I would send a PR for review now. This is continued work on making the uploader work with the importer based uploader backend in order to support geogit stores as well as optionally configuring a temporal dimension on uploaded layers.

@iwillig there is an extraneous jquery.js included for now because require is still not picking up the one with the version number here https://github.com/GeoNode/geonode/tree/master/geonode/static/geonode/libs ... can you help me fix this so we can get rid of this thing again. (/me resolves to finish my bower branch sooner rather than later)