Refactored structure

PHPCI/Plugin.php

@@ -1,19 +0,0 @@
-<?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();
-}