Log Message:
Update py-urwid to 1.3.1:

Urwid 1.3.1
===========

2015-11-01

 * Fix for screen not getting reset on exception regression
   (by Rian Hunter)

 * AttrSpec objects are now comparable (by Random User)

 * MonitoredList now has a clear method if list has a clear method
   (by neumond)

 * Fix for BarGraph hlines sort order (by Heiko Noordhof)

 * Fix for final output not appearing on exit with some terminals
   now that extra newline was removed (by Jared Winborne)

 * Fix for a resizing bug in raw_display (by Esteban null)