Some pyflakes cleaning (pull request from Olf/Florent Fourcot <florent.fourcot@enst-bretagne.fr>)
Accept twitter urls in show, rt and rm commands (adapted from pull request idea by Olf/Florent Fourcot <florent.fourcot@enst-bretagne.fr>)
update script
fix google news urls
better error messages for cancel command
fix lost runlater loop when failed task