Make Handler::before() hierarchy consistent

In API, the before() method (inherited from Handler) takes a $method
argument, although this is not declared for the before method() in
handler.  PHP in strict mode treats this as an error.

Since call sites already pass the $method argument, change
Handler::before() and the before() method in all other subclasses to
take this argument.

classes/protected_handler.php

@@ -1,8 +1,8 @@
 <?php
 class Protected_Handler extends Handler {
 
-	function before() {
-		return parent::before() && $_SESSION['uid'];
+	function before($method) {
+		return parent::before($method) && $_SESSION['uid'];
 	}
 }
 ?>