There is a tip in the Laravel docs on how to do this. This might not have been available at the time of the question, but I thought I would update it with a answer.
http://laravel.com/docs/master/routing#csrf-x-csrf-token
I have tested the meta tag method from the documentation and got it working. Add the following meta tag into your global template
<meta name="csrf-token" content="{{ csrf_token() }}">
Add this JavaScript that sets defaults for all ajax request in jQuery. Preferably in a js file that is included across your app.
$.ajaxSetup({
headers: {
'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')
}
})
This token can exist in the request header or the form. This populates it into the request header of every ajax request.