Some changes.

Controllers/Index.php: Usage in app()->request->method instead of "do" parameter which was used before.
System/functions.php: Unused functions were removed and MyFunctionName functions were renamed to my_function_name.
Validators/Base.php: Base validators is now abstract. Base::lengthIs has removed, Base::lengthBetween has renamed to Base::Length and Base::required is now Base::Required.
Views/form.php: Added a php doc for strong-typed model.