Refactoring: TakeController returned item Mail moved to a listener

The TakeController was manually sending the email message
as well as dealing with item return, so I moved the email message
to it's own listener, I created an event for it and moved the
return part to the item model.

app/Listeners/AlertReturnedItem.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace App\Listeners;
+
+use Mail;
+use App\User;
+use App\Events\ReturnItem;
+use App\Mail\ItemAvailable;
+use Illuminate\Queue\InteractsWithQueue;
+use Illuminate\Contracts\Queue\ShouldQueue;
+
+class AlertReturnedItem
+{
+    /**
+     * Create the event listener.
+     *
+     * @return void
+     */
+    public function __construct()
+    {
+        //
+    }
+
+    /**
+     * Send an email to the user that
+     * is waiting for the item
+     *
+     * @param  ReturnItem  $item
+     * @return void
+     */
+    public function handle(ReturnItem $event)
+    {
+        if ($event->item->waiting_user_id) {
+            $user = User::find($event->item->waiting_user_id);
+            Mail::to($user)->send(
+                new ItemAvailable($user->name, $event->item)
+            );
+        }
+    }
+}