Update Travis config (use PG 9.5).
Update Travis config (use PG 9.5).

scottp-dpaw/oim-cms,scottp-dpaw/oim-cms,scottp-dpaw/oim-cms,parksandwildlife/oim-cms,rockychen-dpaw/oim-cms,parksandwildlife/oim-cms,rockychen-dpaw/oim-cms,parksandwildlife/oim-cms,rockychen-dpaw/oim-cms