[5.6] Add driver provides

[lancepioch]

DI fails with "hash.driver" for the Illuminate\Contracts\Hashing\Hasher contract.

Here's an example that breaks:

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

class HomeController extends Controller
{
    protected $hash;

    public function __construct(\Illuminate\Contracts\Hashing\Hasher $hasher)
    {
        $this->hash = $hasher->make('lance');
    }

    public function index()
    {
        return $this->hash;
    }
}