Helm operator 0.3.0

This release adds dependency handling to the Helm operator.

NB The helm operator will now update dependencies for charts by
default, which means you no longer need to vendor them. You can
switch this behaviour off with the flag --update-chart-deps=false.

Bug fixes

• Improve chance of graceful shutdown
  weaveworks/flux#1439
  and
  weaveworks/flux#1438

Improvements

• The operator now runs helm dep build for charts before installing
  or upgrading releases. This will use a lockfile if present, and
  update the dependencies according to requirements.yaml otherwise
  weaveworks/flux#1450
• A new flag --git-timeout controls how long the Helm operator will
  allow for git operations
  weaveworks/flux#1416
• The Helm operator image now includes the Helm command-line client,
  which makes it easier to troubleshoot problems using kubectl exec
  (as part of
  weaveworks/flux#1450)

Many thanks to everyone who contributed!