Add Go 1.4 to Travis config
Add Go 1.4 to Travis config

See #81

nicrioux/cobra,sdomino/cobra,liggitt/cobra,gosuri/cobra,jrossi/cobra,abhishekgahlot/cobra,akutz/cobra,jlowdermilk/cobra,anthonyfok/cobra,spf13/cobra,simlelievre/cobra,k4rtik/cobra,vikstrous/cobra,eparis/cobra