Added CI_ Prefix to the Cache driver.
diff --git a/system/libraries/Cache/drivers/Cache_memcached.php b/system/libraries/Cache/drivers/Cache_memcached.php
index 5f5a315..ec2fd21 100644
--- a/system/libraries/Cache/drivers/Cache_memcached.php
+++ b/system/libraries/Cache/drivers/Cache_memcached.php
@@ -25,7 +25,7 @@
  * @link		
  */
 
-class Cache_memcached extends CI_Driver {
+class CI_Cache_memcached extends CI_Driver {
 
 	private $_memcached;	// Holds the memcached object