Don't use globals

- Use load_class() to get objects during bootstrap process.
- Change load_class() to accept a class constructor parameter
  instead of previously unused class name prefix.
- Change CI_Router::__construct() to accept  as a parameter.
diff --git a/system/core/Router.php b/system/core/Router.php
index 05263b1..2448d9c 100644
--- a/system/core/Router.php
+++ b/system/core/Router.php
@@ -109,10 +109,8 @@
 	 *
 	 * @return	void
 	 */
-	public function __construct()
+	public function __construct($routing = NULL)
 	{
-		global $routing;
-
 		$this->config =& load_class('Config', 'core');
 		$this->uri =& load_class('URI', 'core');
 
@@ -120,7 +118,7 @@
 		$this->_set_routing();
 
 		// Set any routing overrides that may exist in the main index file
-		if (isset($routing) && is_array($routing))
+		if (is_array($routing))
 		{
 			if (isset($routing['directory']))
 			{