Added $cookieLifetime property

Added $cookieLifetime property so the developer can set the cookie lifetime himself by adding it to the config file

Author: dvdkrgr

components/UserConfig.php

@@ -20,7 +20,12 @@ class UserConfig extends User
 	 * @inheritdoc
 	 */
 	public $enableAutoLogin = true;
-
+	
+	/**
+ 	 * @inheritdoc
+	 */
+	public $cookieLifetime = 2592000;
+  
 	/**
 	 * @inheritdoc
 	 */
@@ -54,4 +59,4 @@ protected function afterLogin($identity, $cookieBased, $duration)
 		parent::afterLogin($identity, $cookieBased, $duration);
 	}
 
-}
+}