Make server listing and single server view API endpoints work

app/Models/Server.php

@@ -22,6 +22,12 @@ class Server extends Model implements CleansAttributes, ValidableContract
 {
     use BelongsToThrough, Eloquence, Notifiable, Validable;
 
+    /**
+     * The resource name for this model when it is transformed into an
+     * API representation using fractal.
+     */
+    const RESOURCE_NAME = 'server';
+
     /**
      * The table associated with the model.
      *