wikimedia/WLMMobile — pull request #156 by jdlrobson (2012-08-21 22:23:57+00:00)
Title: allow user via back button to escape blacklisted pages (bug 39348)

if a page is blacklisted in the page history just pop the last page
in the history.

refactor the hooks for a back button press
also make any asynchronous calls dependant on whether the page has
changed