fixes: #1467

feat(998): append to history on install --replace

Add deployment, service and NOTES to create

fix(helm): read passphrase from prompt

This prompts the user to enter a passphrase if the given PGP key is
encrypted.

Closes #1447

docs(provenance): explain using Keybase.io

chore(README): update install section for Beta.2

docs(*) fix typos in docs

fix(helm): correctly convert types on --set flag

fixes #1449

fix(helm): skip overwriting the lock if it hasn't changed

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

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

'helm dep up' will only overwrite the lock file if the digest has
changed (e.g. the source requirements.yaml is different).

Closes #1438

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