Merge branch 'location'

Add Location model which holds textual, geolocation coordiantes
	or postal addresses. This migrates data off Image model metadata
	onto the general Location model. It also adds the ability for location
	to be set on MediaEntry, User, MediaComment and Collection models.

	The geolocation plugin has been updated so that the location can be displayed
	in more general places rather than explicitely on the MediaEntry view.
	If GPS coordiantes are set for the User the profile page will also have the
	OSM provided by the geolocation plugin.

mediagoblin/tests/test_submission.py

@@ -363,7 +363,7 @@ class TestSubmission:
     def test_media_data(self):
         self.check_normal_upload(u"With GPS data", GPS_JPG)
         media = self.check_media(None, {"title": u"With GPS data"}, 1)
-        assert media.media_data.gps_latitude == 59.336666666666666
+        assert media.get_location.position["latitude"] == 59.336666666666666
 
     def test_processing(self):
         public_store_dir = mg_globals.global_config[