Updated travis for go v1.5
Updated travis for go v1.5

jszroberto/spruce,thomasmmitchell/spruce,jszroberto/spruce,geofffranks/spruce,HeavyWombat/spruce,jszroberto/spruce,thomasmmitchell/spruce,geofffranks/spruce,HeavyWombat/spruce,geofffranks/spruce,thomasmmitchell/spruce,HeavyWombat/spruce