Split helm and tiller packages.

```
$ make build-cross dist VERSION=v2.2.0
CGO_ENABLED=0 gox -output="_dist/{{.OS}}-{{.Arch}}/{{.Dir}}" -osarch='darwin/amd64 linux/amd64 linux/386 windows/amd64 linux/arm'  -tags '' -ldflags ' -X k8s.io/helm/pkg/version
.Version=v2.1.0 -X k8s.io/helm/pkg/version.GitCommit=b3d812b3 -X k8s.io/helm/pkg/version.GitTreeState=dirty -extldflags "-static"' k8s.io/helm/cm
d/helm
Number of parallel builds: 3

-->    darwin/amd64: k8s.io/helm/cmd/helm
-->     linux/amd64: k8s.io/helm/cmd/helm
-->   windows/amd64: k8s.io/helm/cmd/helm
-->       linux/386: k8s.io/helm/cmd/helm
-->       linux/arm: k8s.io/helm/cmd/helm

```

```
$ ls -a _dist/
.   darwin-amd64                     helm-v2.2.0-linux-386.tar.gz    helm-v2.2.0-linux-arm.tar.gz      linux-386    linux-arm
..  helm-v2.2.0-darwin-amd64.tar.gz  helm-v2.2.0-linux-amd64.tar.gz  helm-v2.2.0-windows-amd64.tar.gz  linux-amd64  windows-amd64
```

Had a word with @technosophos and it seems we no longer need hg check as all other repos can be cloned via git

This adds back support for Windows now that it has been tested by the
community.

Closes #1596

This adds a hidden 'helm doc' command that generates documentation out
of the Helm help text.

Currently it can create:

- man pages for HELM(1)
- Markdown documentation
- bash autocompletions

Those are the three built-ins for Cobra.

The command is hidden so that it doesn't show up to the regular user,
since this is really a specialized task. It has the advantage of making
it trivially easy to install man pages and bash completion at installation time.

closes: #1362

fixes #1302

Limit cross builds to linux/amd64 linux/386 darwin/amd64

closes #1214

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

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

The Makefile has clean task that was failing when the ./rootfs/tiller
was not present

* Add README and License files to archive
* Compress archives for smaller download size

https://github.com/kubernetes/helm/issues/999

As of docker 1.10, `-f` has been removed as an option for `docker tag`

https://docs.docker.com/engine/deprecated/

This works around issues where $GOPATH/bin has a different version of
the protobuf Go plugin than the one Kubernetes uses.

Closes #670

See #647

Still needs a dockerfile

/cc @michelleN