Version 0.3.0 Update Kubernetes support to 1.6.1

Potentially breaking changes

• Support for Kubernetes' ReplicationControllers is deprecated; please
  update these to Deployments, which do the same job but much better
  (see
  https://kubernetes.io/docs/user-guide/replication-controller/#deployment-recommended)
• The service<->daemon protocol is versioned. The daemon will now
  crash-loop, printing a warning to the log, if it tries to connect to
  the service with a deprecated version of the protocol.

Improvements

• Updated the version of kubectl bundled in the Flux daemon image,
  to work with newer (>1.5) Kubernetes.
• Added fluxctl save command for bootstrapping a repo from an existing cluster
• You can now record a message and username with each release, which
  show up in notifications