Add SMS support

Summary:
Provides a working SMS implementation with support for Twilio.

This version doesn't really retry if we get any gruff at all. Future versions should retry.

Test Plan: used bin/sms to send messages and look at them.

Reviewers: chad, epriestley

Reviewed By: epriestley

Subscribers: aurelijus, epriestley, Korvin

Maniphest Tasks: T920

Differential Revision: https://secure.phabricator.com/D8930

externals/twilio-php/Services/Twilio/Rest/MediaInstance.php

@@ -0,0 +1,37 @@
+<?php
+
+/**
+ * A single Media object. For the definitive reference, see the `Twilio Media
+ * Documentation <https://www.twilio.com/docs/api/rest/media>`_.
+ *
+ * .. php:attr:: sid
+ *
+ *    A 34 character string that identifies this object
+ *
+ * .. php:attr:: account_sid
+ *
+ *    A 34 character string representing the account that sent the message
+ *
+ * .. php:attr:: parent_sid
+ *
+ *    The sid of the message that created this media.
+ *
+ * .. php:attr:: date_created
+ *
+ *    The date the message was created
+ *
+ * .. php:attr:: date_updated
+ *
+ *    The date the message was updated
+ *
+ * .. php:attr:: content_type
+ *
+ *    The content-type of the media.
+ */
+class Services_Twilio_Rest_MediaInstance extends Services_Twilio_InstanceResource {
+    public function __construct($client, $uri) {
+        $uri = str_replace('MediaInstance', 'Media', $uri);
+        parent::__construct($client, $uri);
+    }
+}
+