Helm operator 0.2.0

In large part this release simplifies and improves the Helm operator
machinery, without changing its effect.

This release drops the -alpha suffix, but remains <1.0 and should
(still) be considered unready for production use.

• Use the same git implementation as fluxd, fixing a number of
  problems with SSH known_hosts and git URLs and so on
  weaveworks/flux#1240
• Always check that a chart release will be a change, before releasing
  weaveworks/flux#1254
• Add validation to the FluxHelmRelease custom resource definition,
  giving the kind the short name fhr
  weaveworks/flux#1253
• Detect chart release differences more reliably
  weaveworks/flux#1272
• Check for more recent versions and report in logs when out of date
  weaveworks/flux#1276

See getting started with
Helm
and the Helm chart
instructions
for information on installing the Flux with the Helm operator.