These days the library has been completely rewritten and improved, so we will see how to install it and use it.
Yowsup is a python library that allows you to login and use the WhatsApp service and provides you with all capabilities of an official WhatsApp client, allowing you to create a full-fledged custom WhatsApp client.
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Try this out only on your old numbers. My main number got blocked by WhatsApp after I tested this library on the Pi a few weeks ago. Now, my number is permanently blocked by WhatsApp :). Use of non-official 3rd party clients for WhatsApp communications cause these pesky account blockages.