PyXG 0.3 released

[brupp]

This is a bugfix release that addresses mainly two points:

* It fixes plist handling for Leopard and Snow Leopard
* A decorator function allows for proper draining of PyObjC pools
(Barry Wark). On systems before Snow Leopard, failing to autorelease
the pools could lead to uncontrolled memory allocation.

For a detailed changelog see RELEASE.rst.

The project is now hosted on Github:
http://github.com/pyxg/pyxg


Thanks to Barry Wark and Brian Granger for their help.