Update travis to test against latest Golang versions 1.6.2 and 1.5.4
Update travis to test against latest Golang versions 1.6.2 and 1.5.4

mjbrender/snap,sandlbn/snap,mkleina/snap,mjbrender/snap,mkleina/snap,intelsdi-x/snap,sandlbn/snap,intelsdi-x/snap