Added MERGE HTTP verb

git-svn-id: http://framework.zend.com/svn/framework/standard/trunk@19706 44c647ce-9c0f-0410-b52a-842ac1e357ba

library/Zend/Http/Client.php

@@ -75,7 +75,8 @@ class Zend_Http_Client
     const DELETE  = 'DELETE';
     const TRACE   = 'TRACE';
     const OPTIONS = 'OPTIONS';
-    const CONNECT = 'CONNECT';
+    const CONNECT = 'CONNECT';
+    const MERGE   = 'MERGE';
 
     /**
      * Supported HTTP Authentication methods