Asynchronous Messaging with OpenERP

We already have synchronous messaging with XML-RPC. Now a new module is created that provides a framework to make async messaging easy with OpenERP.

The module should be used for building integration solutions based on messaging patterns.
It provides:
- A framework for sending and receiving STOMP messages.
- A serializator/deserializator that creates and reads an XML representation of any OpenERP object.
The module is based on Cloves J. G. de Almeida's mbi module, especially the XML serializator.

There's also a demo module that has a pre-built interface to sending and receiving messages.

I've put the modules async_messaging and async_messaging_demo in stable 5.0 extra addons.