Adding Custom domains (#247)

* WIP

* wip

* Finished doing most of the work

app/Http/Kernel.php

@@ -2,6 +2,7 @@
 
 namespace App\Http;
 
+use App\Http\Middleware\CustomDomainRestriction;
 use App\Http\Middleware\EmbeddableForms;
 use App\Http\Middleware\IsAdmin;
 use App\Http\Middleware\IsNotSubscribed;
@@ -26,6 +27,7 @@ class Kernel extends HttpKernel
         \App\Http\Middleware\TrimStrings::class,
         \Illuminate\Foundation\Http\Middleware\ConvertEmptyStringsToNull::class,
         \App\Http\Middleware\SetLocale::class,
+        CustomDomainRestriction::class,
     ];
 
     /**