Update image for Go 1.6

[teelahti]

Currently this image uses golang:latest as base image. That image is already in Go 1.6. A rebuild of this image would give 1.6 for users, could someone do that?

Of course even better would be to have image tags based on Go version, so that users could bind to specific Go version.

[teelahti]

Image has been re-pushed, closing.

[xjewer]

Why close the PR? Specify GOLANG version for build is a significant thing. Could you reopen issue and reword it?

[teelahti]

I agree and would really like to see versioned images. This issue was only about pushing new latest, there already is an issue #17 open about version locking.