This performs a relatively weak in-memory translation of index file
data. It does not, in most cases, write the corrected data to disk, and
it emits a warning directly to STDERR each time it loads a deprecated
index.

Known limitations:

- It cannot recover certain bogus records that earlier alpha releases
  generated (notably, where all chartfile data is missing)
- In some cases, it has to parse a filename to get version info. This is
  lossy.
- Because it takes three passes through the YAML and JSON unmarshal, it
  is not performant.

This feature is transitional and should be removed during the Beta
cycle, prior to the release of 2.0.0.

Closes #1265

docs(using_helm): change reference from npm to CPAN/Fedora DB

Closes #1271

docs(install): Add information on using canary releases

fix(helm): fix tests so that they do not write data into testdata

chore(helm): add test coverage to pkg/helm

This includes documentation on how to use Helm and Tiller canary
releases.

There was a bug in the repo tests that caused them to overwrite the
repositories.yaml file in that directory. Now, the entire tests (server
and client-side) run inside of a temp directory.

fix(chart): Chart.yaml now has an apiVersion field.

feat(helm): implement new index format

This implements a new index file format for repository indices. It also
implements a new format for requirements.yaml.

Breaking change: This will break all previous versions of Helm, and will
impact helm search, repo, serve, and fetch functions.

Closes #1197

fix(helm): change 'helm update' to 'helm repo update'

chore(ci): go1.7.1

The old form is marked deprecated.

Relates to #1196

This is to future-proof charts, and also be consistent with repo and
index YAML files.

Closes #1264

closes #1267

feat(tiller): update Sprig to 2.6.0

ref(helm): refactor {home,lint,serve} commands

ref(*): update to Kubernetes 1.4

issue/1254

Fix typo in using_helm.md that refers to "glide install".  The
reference should be to "helm install".

fix(proto): remove unused fields

feat(ci): automate release builds on circleci

fix(1245): hook up revision flag to helm get {manifest,values,hooks}

docs(chart_repository): added github pages example

Some fields were introduced to Chart metadata after Alpha.4, but are not
going to be used ever. So we made the decision to remove them before we
get stuck with ugliness.

This should not break compatibility, since these fields were not used.

feat(*): add rollback to a release version

closes #1244

docs(install, using): add installation and usage docs

docs(charts): fix charts docs to reflect current template practices

docs(glossary): added glossary

feat(*): add helm rollback functionality