PyCon: Asynchronous I/O: glib

I recently added (experimental) Tulip support to 0install (it uses it if the glib Python bindings aren't available). The conversion from glib to tulip was straight-forward and, although the code was designed for glib, it was actually cleaner after conversion, IMHO:

https://github.com/0install/0install/commit/2b13b69ace187...

(the patch also adds a compatibility wrapper to make glib look like tulip, but it only implements the minimal functionality that I needed)

This should be a big win for the Windows port, which currently has to bundle the whole glib/gobject/gi stack just for the event loop.