docs(provenance): describe signature authority

fix(tiller): fix wording for a few errors

fix(tiller): fix nil pointers in error messages

This changes the wording of a log and an error message to make it
clearer what is happening.

There were a few places where error messages were accessing properties
of objects that were nil because of the error.

Closes #1374

fix(kube): find current resource by name and kind

fix(*): statically link cross builds

fix(helm): return correct version on dep up

docs(*): refresh docs

closes: #1362

fix(1333): cannot delete release in failed state

There was an extra return statement in a helper that was causing
the download manager to get a false positive on a release version.

Closes #1383

This resolves #1210. Update will find current resource
by name and kind for comparison purposes.

This refreshes docs, as discussed in #719, and adds a few new sections
to the docs.

Closes #719

Fix/tiller helm flags

docs(helm): Fix broken link to glide project

fix(linter): add engine.FuncMap so linter can use real function list

chore(docs): fix nginx example templates

Closes #1072

This adds a function engine.FuncMap that returns a function mapping that
better represents the functions passed to a template. The linting logic
is reconfigured to use this function instead of the sprig.FuncMap
function.

Closes #1366

fix(lint): validateNoMissingValues template regex

fix(lint): use correct hash key for rendered tmpl

fix(helm): make 'helm install' output more consistent

The YAML validation was broken because the renderedContentMap has keys
with the path to the template including the chart directory, whereas the
linter was trying to access it relative from the chart directory.

For example, the hash key was `drupal/templates/deployment.yaml` but the
linter was trying to access `templates/deployment.yaml`. This commit
fixes the key used to access the rendered content.

Fixes the regex for extracting templates to include templates that
suppress newlines and ignore any conditional flow statements.

This fixed capitalization differences, removed duplicate fields,
clarified a few things, and changed a few display names.

Closes #1135

feat(helm): add canary option to init command

fix(helm): allow entries to be merged into index

To install the tiller canary `helm init --canary`

feat(helm): add kubeconfig context switching to init command

Between Alpha.4 and Alpha.5 there was a change in the indexing logic.
This prevent indices from being appended to (because those index files
were often broken). This change allows the user to explicitly merge an
existing index and a generated index.

Closes #1334

- decouple tunnel from kube client
- add context switching for init cmd
- add unit tests for installer and init command
- refactor installer and remove unused code

docs(chart_repositories): document correct index example

feat(helm): add kubeconfig context switching