Add travis cache
Add travis cache

mapfish/mapfish-print,Galigeo/mapfish-print,mapfish/mapfish-print,marcjansen/mapfish-print,Galigeo/mapfish-print,marcjansen/mapfish-print,marcjansen/mapfish-print,mapfish/mapfish-print,Galigeo/mapfish-print,marcjansen/mapfish-print,mapfish/mapfish-print,mapfish/mapfish-print