Partially rewrite the client options bits and remove some madness.

The concept is now similar to a little dependency-injection system.

lib/Predis/Options/IClientOptions.php

@@ -0,0 +1,21 @@
+<?php
+
+/*
+ * This file is part of the Predis package.
+ *
+ * (c) Daniele Alessandri <suppakilla@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Predis\Options;
+
+/**
+ * Marker interface defining a client options bag.
+ *
+ * @author Daniele Alessandri <suppakilla@gmail.com>
+ */
+interface IClientOptions
+{
+}