Updated to latest pypubsub: v3.2.0

git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@74821 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
CHG: moved examples folder into pubsub so that users have access to examples in wx/lib/pubsub

git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@74822 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775