Refactored E107Base suite cleanup into "Preparer" classes

Now works with the best of both worlds:

* Barebones cleanup in slow Windows environments
* Git snapshots in other Git environments

lib/preparers/PreparerFactory.php

@@ -0,0 +1,57 @@
+<?php
+spl_autoload_register(function($class_name) {
+	$candidate_path = __DIR__ . "/$class_name.php";
+	if (file_exists($candidate_path))
+	{
+		include_once($candidate_path);
+	}
+});
+
+class PreparerFactory
+{
+	/**
+	 * @return Preparer
+	 */
+	public static function create()
+	{
+		if (self::systemIsSlow())
+		{
+			return self::createFromName('E107Preparer');
+		}
+		elseif (self::systemHasGit() && self::appPathIsGitRepo())
+		{
+			return self::createFromName('GitPreparer');
+		}
+		return self::createFromName('E107Preparer');
+	}
+
+	/**
+	 * @param $class_name
+	 * @return Preparer
+	 */
+	public static function createFromName($class_name)
+	{
+		codecept_debug('Instantiating Preparer: ' . $class_name);
+		return new $class_name();
+	}
+
+	private static function systemIsSlow()
+	{
+		return self::systemIsWindows();
+	}
+
+	private static function systemIsWindows()
+	{
+		return strtolower(substr(php_uname('s'), 0, 3)) === 'win';
+	}
+
+	private static function systemHasGit()
+	{
+		return stripos(shell_exec('git --version'), 'git version') !== false;
+	}
+
+	private static function appPathIsGitRepo()
+	{
+		return file_exists(APP_PATH."/.git");
+	}
+}