v0.3: Deployer UX fixes!

• No need to restart hub manually after some changes - it is
  automatically restarted now. You can disable an automatic
  restart of hub after an upgrade with the following:

  1. Finding out the current helm release's revision
  2. Adding '--set revisionOverride=' to your
     upgrade command.

  Only do this if you know exactly what you are doing :)

• Base images for everything upgraded to ubuntu 17.04. We can
  define the support lifecycle for the helm chart in the future,
  and decide on the base images at that point.

• Add a timestamp to the job name for the pre-puller job. This
  prevents having to manually delete it when an install fails and
  has to be tried again. Because the Release Revision hadn't changed
  when the upgrade fails, trying again will cause it to fail with a
  'job already exists' error. Adding the Timestamp to job name should
  hopefully fix that