Some preliminary work on issue #6. Breaks a lot of tests. [skip ci]

app/lib/Firefly/Storage/Piggybank/PiggybankRepositoryInterface.php

@@ -23,6 +23,16 @@ interface PiggybankRepositoryInterface
      */
     public function count();
 
+    /**
+     * @return mixed
+     */
+    public function countRepeating();
+
+    /**
+     * @return mixed
+     */
+    public function countNonrepeating();
+
     /**
      * @param $data
      *