Add iPad to the list of mobile clients.

Fixes #2452

lib/Cake/Network/CakeRequest.php

@@ -104,7 +104,7 @@ class CakeRequest implements ArrayAccess {
 		'ajax' => array('env' => 'HTTP_X_REQUESTED_WITH', 'value' => 'XMLHttpRequest'),
 		'flash' => array('env' => 'HTTP_USER_AGENT', 'pattern' => '/^(Shockwave|Adobe) Flash/'),
 		'mobile' => array('env' => 'HTTP_USER_AGENT', 'options' => array(
-			'Android', 'AvantGo', 'BlackBerry', 'DoCoMo', 'Fennec', 'iPod', 'iPhone',
+			'Android', 'AvantGo', 'BlackBerry', 'DoCoMo', 'Fennec', 'iPod', 'iPhone', 'iPad',
 			'J2ME', 'MIDP', 'NetFront', 'Nokia', 'Opera Mini', 'Opera Mobi', 'PalmOS', 'PalmSource',
 			'portalmmm', 'Plucker', 'ReqwirelessWeb', 'SonyEricsson', 'Symbian', 'UP\\.Browser',
 			'webOS', 'Windows CE', 'Windows Phone OS', 'Xiino'