Update Node to 5.2.0

[jbergstroem]

Because its new. Assume I screwed this PR up! :)

[Starefossen]

The Docker files looks solid to me, however we only keep the latest version of each supported major version on the repo. So rather than add a new 5.2 directory we just rename 5.1 and update the NODE_VERSION variables.

Also, when updating the latest stable version, the Docker Registry updater file needs to be changed https://github.com/nodejs/docker-node/blob/master/generate-stackbrew-library.sh#L8

[jbergstroem]

@Starefossen thanks for the feedback. Rebased against master and pushed a new commit.

[Starefossen]

Thanks 👍 Merged.

[Starefossen]

Now, clone https://github.com/docker-library/official-images and from the docker-node repo run the following command before submitting a PR back to the official-images repo.

$ ./generate-stackbrew-library.sh > /path/to/docker-library/official-images/library/node

[jbergstroem]

Thanks for merging. I gotta run -- suggest someone else does above unless a few hours of wait is ok.

[Starefossen]

PR to the official registry submitted 😄

[Starefossen]

v5.2.0 is now live on Docker Hub ✨🐳🐢🚀✨