update travis compiler to work with node 4
update travis compiler to work with node 4

GrayOverride/styleguide,tiaoshi/styleguide,GrayOverride/styleguide,blandine/styleguide,Teleopti/styleguide,tiaoshi/styleguide,alinanmorariu/styleguide,tiaoshi/styleguide,Teleopti/styleguide,blandine/styleguide,blandine/styleguide,GrayOverride/styleguide,alinanmorariu/styleguide,alinanmorariu/styleguide