support "Conditionally Adding Rules"

[devmark]

something like:

$v->sometimes('reason', 'required|max:500', function($input)
{
    return $input->games >= 100;
});

[andersao]

I've been very busy in recent months with my work projects, which eventually pulling away of my personal projects, so it could not provide the necessary support to you, I am more relaxed now and I'm checking all the issues in order to work on fixes and new implementations, apologize to everyone.