Add Google authentication

vendor/OAuth/OAuth2/Service/Exception/InvalidScopeException.php

@@ -0,0 +1,17 @@
+<?php
+
+/**
+ * @author David Desberg <david@daviddesberg.com>
+ * Released under the MIT license.
+ */
+
+namespace OAuth\OAuth2\Service\Exception;
+
+use OAuth\Common\Exception\Exception;
+
+/**
+ * Exception thrown when a scope provided to a service is invalid.
+ */
+class InvalidScopeException extends Exception
+{
+}