Started a basic interface to manipulate files in acceptance tests

- MOD: Renamed lib/deployers/cpanel_deployer.php to
       lib/deployers/cPanelDeployer.php
- MOD: Moved responsibility of reconfiguring Codeception modules to the
       deployers.
- NEW: Abstract class Deployer to standardize the interface to Deployers
- NEW: Acceptance tests now support unlinkE107ConfigFromTestEnvironment
- MOD: Removed null checks for the Deployer in the Base Module
- MOD: Improved public method naming in the Base Module
- MOD: DeployerFactory always returns a Deployer implementation now.
- MOD: InstallCest always clears out the e107_config.php file before
       each test.

lib/deployers/Deployer.php

@@ -0,0 +1,29 @@
+<?php
+
+abstract class Deployer
+{
+	abstract public function start();
+	abstract public function stop();
+
+	protected $components = array();
+
+	/**
+	 * @param array $components
+	 */
+	public function setComponents($components)
+	{
+		$this->components = $components;
+	}
+
+	/**
+	 * Methods not implemented
+	 *
+	 * @param $method_name
+	 * @param $arguments
+	 * @return null
+	 */
+	public function __call($method_name, $arguments)
+	{
+		return null;
+	}
+}