Add a simple Gtk.ListBox and Gtk.ListBoxRow example
Correct Listbox example filename

Correct a last-second mistake in the Listbox example filename, now the example
shows up correctly
Merge pull request #38 from gianmt/upstream

Correct Listbox example filename
Add Gtk namespace in front of classes
Make prints python 3 compatible
Merge pull request #39 from sullenel/python3-prints

Make prints python 3 compatible
Merge remote-tracking branch 'upstream/master'

Conflicts:
	source/layout.txt