Begin "implementing" configuration stage

lib/servers/configuration.ex

@@ -227,7 +227,17 @@ defmodule Amethyst.Server.Configuration do
   end
 
   ## HANDLING
+  def handle({:serverbound_plugin_message, channel, data}, client) do
+    handle_plugin_message(channel, data, client)
+  end
   def handle(tuple, _) do
     Logger.error("Unhandled but known packet #{elem(tuple, 0)}")
   end
+  defp handle_plugin_message("minecraft:brand", data, _client) do
+    {[brand], ""} = Read.start(data) |> Read.string |> Read.stop
+    Logger.info("Client using brand: #{brand}")
+  end
+  defp handle_plugin_message("amethyst:hello", _data, _client) do
+    Logger.info("Client is Amethyst aware! Hello!")
+  end
 end

lib/servers/login.ex

@@ -116,8 +116,8 @@ defmodule Amethyst.Server.Login do
       transmit({:login_success, uuid, name, [], false}, client)
     end
   end
-  def handle({:login_acknowledged}, _client) do
+  def handle({:login_acknowledged}, client) do
-    raise RuntimeError, "Configuration stage is not implemented."
+    Amethyst.Server.Configuration.serve(client)
   end
   def handle(tuple, _) do
     Logger.error("Unhandled but known packet #{elem(tuple, 0)}")