Fix issue where values are not recursively deleted. ie:

$this->Cookie->write('User.email', 'test@example.com');
$this->Cookie->delete('User');
The cookie for User.email would not be removed (despite being removed from the __values array.
Fixes #1651

Signed-off-by: mark_story <mark@mark-story.com>

cake/libs/controller/components/cookie.php

@@ -281,8 +281,14 @@ function delete($key) {
 			$this->read();
 		}
 		if (strpos($key, '.') === false) {
+			if(isset($this->__values[$key]) && is_array($this->__values[$key])) {
+				foreach($this->__values[$key] as $idx => $val) {
+					$this->__delete("[$key][$idx]");
+				}
+			} else {
+				$this->__delete("[$key]");
+			}
 			unset($this->__values[$key]);
-			$this->__delete("[$key]");
 			return;
 		}
 		$names = explode('.', $key, 2);