Fix man page

Import from
http://bazaar.launchpad.net/~ubuntu-branches/ubuntu/vivid/guake/vivid/view/head:/debian/patches/fix_manpage.diff


Signed-off-by: Gaetan Semet <gaetan@xeberon.net>
force launch with python2

Signed-off-by: Gaetan Semet <gaetan@xeberon.net>