fix(travis): Pin to trusty (#3347)
fix(travis): Pin to trusty (#3347)


david-garcia-nete/karma,johnjbarton/karma,maksimr/karma,karma-runner/karma,karma-runner/karma,johnjbarton/karma,johnjbarton/karma,david-garcia-nete/karma,maksimr/karma,johnjbarton/karma,karma-runner/karma,maksimr/karma,david-garcia-nete/karma,karma-runner/karma