changed $xmlrpcDateTime property to all lowercase 'datetime.iso8601' so it can be recognized as a valid XML-RPC type

http://codeigniter.com/bug_tracker/bug/4153/
diff --git a/system/libraries/Xmlrpc.php b/system/libraries/Xmlrpc.php
index b8ac3be..32d7396 100644
--- a/system/libraries/Xmlrpc.php
+++ b/system/libraries/Xmlrpc.php
@@ -38,7 +38,7 @@
 	var $xmlrpcBoolean	= 'boolean';

 	var $xmlrpcDouble	= 'double';	

 	var $xmlrpcString	= 'string';

-	var $xmlrpcDateTime	= 'dateTime.iso8601';

+	var $xmlrpcDateTime	= 'datetime.iso8601';

 	var $xmlrpcBase64	= 'base64';

 	var $xmlrpcArray	= 'array';

 	var $xmlrpcStruct	= 'struct';

@@ -1416,6 +1416,6 @@
 	

 }

 // END XML_RPC_Values Class

-
-/* End of file Xmlrpc.php */
+

+/* End of file Xmlrpc.php */

 /* Location: ./system/libraries/Xmlrpc.php */
\ No newline at end of file
diff --git a/user_guide/changelog.html b/user_guide/changelog.html
index e08b715..35f67fd 100644
--- a/user_guide/changelog.html
+++ b/user_guide/changelog.html
@@ -143,6 +143,7 @@
 	<li>Fixed a bug in display_error() in the DB driver that was instantiating new Language and Exception objects, and not using the error heading.</li>

 	<li>Fixed an array to string conversion error in the Validation library (#4425)</li>

 	<li>Fixed a bug (#4506) with overlay_watermark() in the Image library preventing support for PNG-24s with alpha transparency</li>

+	<li>Fixed a bug (#4153) in the XML-RPC class preventing dateTime.iso8601 from being used.</li>

 </ul>

 

 <h2>Version 1.6.1</h2>