fix(helm): create index file as 'helm serve' starts up.

feat(scripts): add 'get' script to download and install

This adds 'scripts/get`, which is a bash script for fetching and
installing the Helm client. It has the following features:

- It uses the GitHub API to discover the latest release
- It downloads the SHA256 checksum and verifies the binary using it
- It does basic tests on the installation

When 'helm serve' is run, this now generates an index.yaml file. Before,
that file was maintained externally, often manually.

Closes #793
Partially addresses #1404

docs(helm): update grammar for upgrade command help

fix(helm): add support for local version only

This changes from --client-only and --server-only to --client and
--server. With this change, if no flags are specified, all info is
shown. If one flag is specified, only its info is shown.

Fixes #1443

docs(provenance.md): make amendments and add clarification

This modifies 'helm version' to allow for local-only or server-only
versions to avoid cases where calling 'helm version' was resulting in
errors.

Closes #1440

docs(install): show tiller image upgrade option

fix(helm): add line feed between --values and --set data

fix(tiller): correct path to NOTES.txt template

fix(helm): add check for argument length for inspection subcommands

Fix broken links in README

subcommands

Currently, --set simply appends data to the end of the existing values
YAML data. If a values file does not have a line feed at the end, the
set data is mis-appended. This fixes the issue by inserting a linefeed
between the --values data and --set data.

Closes #1430

fix(helm): add dry-run flag for init

fix(helm): use 127.0.0.1 instead of localhost

Fixes #1429

This switches the local chart repo to use 127.0.0.1 instead of localhost
so that the net library does not negotiate localhost to an IPv6 address,
which is known to cause issues in some Docker containers.

Breaking Change: When testing on a system that does NOT have IPv4
configured, this will break 'helm serve'. We estimate this will impact
none of the current user base.

Closes #1410

This adds a --dry-run flag to init, and causes the manifest file for
Tiller to be emitted on --debug. Together, this means you can do a
'helm init --dry-run --debug' and dump the Tiller manifest much as you
can with 'helm install --dry-run --debug'.

This does not require a server round-trip.

Closes #1417

Add compression to configmap storage driver

This provides an example of an in-place upgrade to Tiller using `kubectl
set image`.

Minor typo fix

fix(helm): finish repo index.html

docs(*): Minor corrections kebuctl commands in install.md

fix(helm): update helm commands usage text

This commit changes the configmap storage driver to compress
the serialized release before storing it as a base64 encoded string.
This change is backward compatible as it handles existing releases
gracefully by skipping the decompression step when the gzip magic
header is not present.

Fixes #1393

update helm commands usage text to reflect current state

Fixes #1266

fix(repo): ensure index generates in the right order

fix(tiller): ensure only the parent NOTES is used