docs(charts_tips_and_tricks): SAP and Deis examples

This adds a couple of examples for building an application chart for
complex multi-part applications.

fix(helm): fix tests if tmp directory is on another block device

Two non-exported helper functions were added to the repo index test
file. They first try to link the file, since this is optimal. If the
link fails a copy occurs.

Fixes #1472

fix(tiller): allow 3rd party APIs

This feature has been disabled in the past because simply enabling the
feature causes the Kubernetes library to make requests to a server.
Thus, running any tests that use the 'pkg/kube' library has required
running a kube API server.

This patch makes it possible to selectively activate 3rdParty API
support, and then disables that support during testing.

Future versions of the Kubernetes library appear to make it easier to
configure and mock this behavior, so this is most likely a stop-gap
measure. (Famous last words.)

Closes #1472

docs(kubernetes_distros): add notes on kube distros

This adds a place to put distribution-specific information about
different distributions of Kubernetes.

fix(helm): add kubernetes defaults to context

fixes: #1467

docs(install): document installer script

fix(helm): fail when helm deps are not fetched

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

This changes the behavior of the bulk downloader to fail as soon as it
encounters a dependency that it cannot fetch.

Closes #1439

This adds documentation for 'scripts/get'.

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