Updated geo_index checking to be recursive

Fixes #127 - Embedded Documents can declare geo indexes and have
them created automatically

tests/fields.py

@@ -1312,6 +1312,27 @@ class FieldTest(unittest.TestCase):
 
         Event.drop_collection()
 
+    def test_geo_embedded_indexes(self):
+        """Ensure that indexes are created automatically for GeoPointFields on
+        embedded documents.
+        """
+        class Venue(EmbeddedDocument):
+            location = GeoPointField()
+            name = StringField()
+
+        class Event(Document):
+            title = StringField()
+            venue = EmbeddedDocumentField(Venue)
+
+        Event.drop_collection()
+        venue = Venue(name="Double Door", location=[41.909889, -87.677137])
+        event = Event(title="Coltrane Motion", venue=venue)
+        event.save()
+
+        info = Event.objects._collection.index_information()
+        self.assertTrue(u'location_2d' in info)
+        self.assertTrue(info[u'location_2d']['key'] == [(u'location', u'2d')])
+
     def test_ensure_unique_default_instances(self):
         """Ensure that every field has it's own unique default instance."""
         class D(Document):