Add Balanced Payments API

Summary: Adds the Balanced PHP API to externals/. Ref T2787.

Test Plan: Used in next diff.

Reviewers: btrahan, chad

Reviewed By: chad

CC: aran, aurelijus

Maniphest Tasks: T2787

Differential Revision: https://secure.phabricator.com/D5764

externals/restful/src/RESTful/Exceptions/NoResultFound.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace RESTful\Exceptions;
+
+/**
+ * Indicates that a query unexpectedly returned no results.
+ */
+class NoResultFound extends Base
+{
+}