Updated to GeoExplorer 4.0.2 and included the MousePosition.js OpenLayer...

Updated to GeoExplorer 4.0.2 and included the MousePosition.js OpenLayer's control.

Ariel, not sure how to reference the git hash in setup.py: should we fork the suite using the GeoNode account and then sending there a PR with my changes to the suite? Please find out what works best for us :)

Please let me know when it is ready, as I need to make a modification to the map_geoexplorer.js file to include the mouse position within GeoNode.