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/handler.php

@@ -12,7 +12,7 @@ class Handler {
 		return true;
 	}
 
-	function before() {
+	function before($method) {
 		return true;
 	}