update deps for debian packaging
update deps for debian packaging

At some point it would be best for us to tag a point release; but let's wait
until cairocffi 0.7 is in debian unstable, and then we can tag a point release
and do a debian upload. For now, anyway, these are the right dependencies.

Closes #724

dequis/qtile,rxcomm/qtile,tych0/qtile,xplv/qtile,himaaaatti/qtile,ramnes/qtile,jdowner/qtile,ramnes/qtile,frostidaho/qtile,nxnfufunezn/qtile,soulchainer/qtile,de-vri-es/qtile,farebord/qtile,nxnfufunezn/qtile,frostidaho/qtile,qtile/qtile,kynikos/qtile,flacjacket/qtile,kopchik/qtile,kseistrup/qtile,zordsdavini/qtile,cortesi/qtile,qtile/qtile,flacjacket/qtile,soulchainer/qtile,dequis/qtile,kseistrup/qtile,cortesi/qtile,StephenBarnes/qtile,kynikos/qtile,zordsdavini/qtile,de-vri-es/qtile,StephenBarnes/qtile,himaaaatti/qtile,xplv/qtile,kopchik/qtile,jdowner/qtile,tych0/qtile,farebord/qtile,rxcomm/qtile