[pygtk] Windows installer components

[John Stowers]

> 
> 
> So for each version of python that we decided to support (and using
> python 2.6.5 in this example) the pygtk installer needs to install: 
> - PyGObject 
> - PyCairo 

This sounds good, a worthwhile improvement would certainly be to include
all the necessary python installers together.

So as far as my understanding goes, the installer would include the
others, and call them silently...?

A full 'all in one' installer that also includes the gtk bundle could
then be handled at a later time.

John