Reduce ppa and explicit package usage
Reduce ppa and explicit package usage

Should fix travis builds despite package compatibilit bugs
(https://travis-ci.org/CartoDB/Windshaft-cartodb/builds/14314805)

UCL-ShippingGroup/Windshaft-cartodb,CartoDB/Windshaft-cartodb,CartoDB/Windshaft-cartodb,UCL-ShippingGroup/Windshaft-cartodb,manueltimita/Windshaft-cartodb,manueltimita/Windshaft-cartodb,manueltimita/Windshaft-cartodb,CartoDB/Windshaft-cartodb,CartoDB/Windshaft-cartodb,UCL-ShippingGroup/Windshaft-cartodb