Refactored structure

src/PHPCI/Plugin.php

@@ -0,0 +1,19 @@
+<?php
+/**
+ * PHPCI - Continuous Integration for PHP
+ *
+ * @copyright    Copyright 2014, Block 8 Limited.
+ * @license      https://github.com/Block8/PHPCI/blob/master/LICENSE.md
+ * @link         https://www.phptesting.org/
+ */
+
+namespace PHPCI;
+
+/**
+* PHPCI Plugin Interface - Used by all build plugins.
+* @author   Dan Cryer <dan@block8.co.uk>
+*/
+interface Plugin
+{
+    public function execute();
+}