Add another blank line before main()
Remove mention of PyGTK in setup.py
Deal with ImportError when AppIndicator3 is not available

Don't really know if this is the way you would do such a thing in
Python...
Remove OldTrayIcon

It's definitely never going to be available for GTK+3.
This means we can simplify the tray_icon choosing logic.
Update version number and Changelog
Document loss of Python 2.6 support
Merge pull request #12 from leighman/gtk3

Drop broken old code for supporting Gtk+ 2, PyGtk, EggTrayIcon

Picks up the rest of the commits, resolves merge conflict in NEWS.rst.

I also addes a few more details to NEWS.rst and dropped Python 2.6 from
tox.ini and .travis.yml.