Move API to use JSON:API standards and fractal serializer

Makes the data slightly more complex, but forces a standard and can
always be changed down the road simply by changing the default
serializer.

app/Transformers/User/AllocationTransformer.php

@@ -55,6 +55,7 @@ class AllocationTransformer extends TransformerAbstract
     public function transform(Allocation $allocation)
     {
         return [
+            'id' => $allocation->id,
             'ip' => $allocation->alias,
             'port' => $allocation->port,
             'default' => ($allocation->id === $this->server->allocation_id),