Expand API to return transaction groups.

app/Api/V2/Controllers/Controller.php

@@ -148,7 +148,7 @@ class Controller extends BaseController
         $objects = $paginator->getCollection();
 
         // the transformer, at this point, needs to collect information that ALL items in the collection
-        // require, like meta data and stuff like that, and save it for later.
+        // require, like meta-data and stuff like that, and save it for later.
         $transformer->collectMetaData($objects);
 
         $resource = new FractalCollection($objects, $transformer, $key);