Bump VERSION, update CHANGELOG and release.

CHANGELOG

@@ -1,4 +1,4 @@
-v0.6.6 (2011-xx-xx)
+v0.6.6 (2011-04-01)
   * Switched to Redis 2.2 as the default server profile (there are no changes 
     that would break compatibility with previous releases). Long command names 
     are no more supported by default but if you need them you can still require 

VERSION

@@ -1 +1 @@
-0.6.6-dev
+0.6.6

lib/Predis.php

@@ -28,7 +28,7 @@ class MalformedServerResponse extends CommunicationException { }    // Unexpecte
 /* ------------------------------------------------------------------------- */
 
 class Client {
-    const VERSION = '0.6.6-dev';
+    const VERSION = '0.6.6';
     private $_options, $_connection, $_serverProfile, $_responseReader;
 
     public function __construct($parameters = null, $clientOptions = null) {