Update project with Laravel 4.1

I create a new PR with last development.
Original thread: https://github.com/mikelbring/tinyissue/pull/186

I don't think I can continue develop the update project for laravel 4, this is an huge work and I afraid to forget the features.
But we can continue the discussion on the update tinyissue with laravel 4, I think is important for the maintenance of this project.