Here is a middleware class for laravel 5 that takes incoming routes and forces them to lowercase.

LowercaseRoutes.php

<?php

namespace App\Http\Middleware;

use Closure;
use \Illuminate\Support\Facades\Redirect;

class LowercaseRoutes
{
    /**
     * Run the request filter.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        if(!ctype_lower(preg_replace('/[^A-Za-z]/', '', $request->path()))){
    		$new_route = str_replace($request->path(), strtolower($request->path()), $request->fullUrl());
    		return Redirect::to($new_route, 301);
    	}

        return $next($request);
    }

}

Thank you for this gist!