massive cleanups

- renamed classes
- updated to phpunit
- more PSR compliance

lib/Unirest/Method.php

@@ -0,0 +1,12 @@
+<?php
+
+namespace Unirest;
+
+interface Method
+{
+    const DELETE = 'DELETE';
+    const GET = 'GET';
+    const PATCH = 'PATCH';
+    const POST = 'POST';
+    const PUT = 'PUT';
+}