Add Gittip example

examples/gittip_send_tip.php

@@ -0,0 +1,28 @@
+<?php
+require '../src/Curl.class.php';
+
+
+define('GITTIP_USERNAME', 'XXXXXXXXXX');
+define('GITTIP_API_KEY', 'XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX');
+
+$data = array(
+    array(
+        'username' => 'user' . mt_rand(),
+        'platform' => 'gittip',
+        'amount' =>  '0.02',
+    ),
+    array(
+        'username' => 'user' . mt_rand(),
+        'platform' => 'gittip',
+        'amount' =>  '0.02',
+    ),
+);
+
+$curl = new Curl();
+$curl->setHeader('Content-Type', 'application/json');
+$curl->setBasicAuthentication(GITTIP_API_KEY);
+$curl->post('https://www.gittip.com/' . GITTIP_USERNAME . '/tips.json', json_encode($data));
+
+foreach ($curl->response as $tip) {
+    echo $tip->amount . ' given to ' . $tip->username . '.' . "\n";
+}