Remove int cast from authentication adapters.

Forcing an int cast makes using the contain option difficult as you are
also required to manually set the recursive option. Omitting the
cast allows recursive to be set to null.

Fixes #3347

lib/Cake/Controller/Component/Auth/BaseAuthenticate.php

@@ -84,7 +84,7 @@ protected function _findUser($username, $password) {
 		}
 		$result = ClassRegistry::init($userModel)->find('first', array(
 			'conditions' => $conditions,
-			'recursive' => (int)$this->settings['recursive'],
+			'recursive' => $this->settings['recursive'],
 			'contain' => $this->settings['contain'],
 		));
 		if (empty($result) || empty($result[$model])) {

lib/Cake/Controller/Component/Auth/DigestAuthenticate.php

@@ -170,7 +170,7 @@ protected function _findUser($username, $password) {
 		}
 		$result = ClassRegistry::init($userModel)->find('first', array(
 			'conditions' => $conditions,
-			'recursive' => (int)$this->settings['recursive']
+			'recursive' => $this->settings['recursive']
 		));
 		if (empty($result) || empty($result[$model])) {
 			return false;