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

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

Closes #1241

chore(repo): Rename default charts repo to 'stable'

fix(tiller): Order the manifests before sending to k8s

Added glossary to the index on README as well.

Closes #1213

This orders manifests both for installs and deletes so that the
manifests are ordered by kind.

Closes #1228