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

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

This feature allows you to rollback release to the
previous version of release.
resolves #1004

This starts with #1211 and does the other updates necessary for
bumping us to Kubernetes 1.4.

feat(helm): update helm search

Switch 'helm search' from file crawling to using the indices. Also
add scorable indexing, forward porting the search code I originally
wrote for Helm Classic.

Closes #1226
Partially addresses #1199

chore(*): bump grpc to 1.0.1-GA