autox: port to Python.

I still need to figure out the build system part of this, but
here's a first look at a version that runs under Karmic with
the python-xlib package installed.

I'll start adding additional stuff to this soon (e.g. get
ID of window that's focused / has title "X" / is listed in
the active window property).

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/1148006
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