embed() doesn't load default config

Fix issue 458

IPython/frontend/terminal/embed.py

@@ -240,6 +240,7 b' def embed(**kwargs):'
     if config is None:
         config = load_default_config()
         config.InteractiveShellEmbed = config.TerminalInteractiveShell
+        kwargs['config'] = config
     global _embedded_shell
     if _embedded_shell is None:
         _embedded_shell = InteractiveShellEmbed(**kwargs)