JSON: include marker class in GeoJSON details ushahidi#853

This is a hack so when plugins like sharing_two pass extra markers
via events we can tell which is which. Sure there is a better way
but this is quick.

application/controllers/json.php

@@ -214,7 +214,8 @@ protected function markers_geojson($incidents, $category_id, $color, $icon, $inc
 				'icon' => $icon,
 				'thumb' => $thumb,
 				'timestamp' => strtotime($marker->incident_date),
-				'count' => 1
+				'count' => 1,
+				'class' => get_class($marker)
 			);
 			$json_item['geometry'] = array(
 				'type' => 'Point',