Add support for a native python binding

[Duncan McGreggor]

The GEIS API implementation for C uses XCB. There are Python bindings for XCB available:
  http://xcb.freedesktop.org/XcbPythonBinding/

There seems to be no reason we can't support a native Python GEIS API using the Python XCB binding.

[Allen Lowe (lallenlowe)]

Especially considering how much of the Canonical-funded software is written in, or involves, python. I develop mainly in Python, and can't wait to get my hands on the GEIS API.

[Duncan McGreggor (oubiwann)]

There's a lot of work to be done here, so probably best to define all the work items (bugs as tasks) and associate them with a new blueprint. When I get the time, I'll do that and then update this ticket with that info.

[Duncan McGreggor (oubiwann)]

Cody implemented Python bindings using the GObject introspection. However, there appear to be limitations (e.g., only one callback can be passed at a time to a method).

We may have to continue with the standard Python bindings.