qasystem/database/migrations/2015_01_15_114412_create_role_user_table.php

<?php
use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreateRoleUserTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('role_user', function (Blueprint $table) {
            $table->increments('id')->unsigned();
            $table->integer('role_id')->unsigned()->index();
            $table->integer('user_id')->unsigned()->index();
            $table->timestamps();
        });

    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::drop('role_user');
    }
}