chore(*): bump to 2.1.2

fix(upgrade):Check the raw vals during an upgrade properly

fix(helm): fix rollback documentation

docs(chart_template_guide): link to Go template docs

feat(helm): add release debugging for upgrade

chart repo docs: small correction/clarification

Typo in helm quickstart guide.

Fixed a small typo in the quickstart guide. Change 'upgrade' to
'upgraded' to match tense.

fix(linter): disable checking for empty values

chore(docs): add how to submit proposals

fix(helm): add tiller-host to plugin environment

This adds a link to the Go template docs regarding whitespace.

resolves #1463

fix(*): Fixes protobuf name

s/backup up/back up/

ref(helm): only pass required dependencies to subcommands

The generated version of the protobuf did not match the `.proto` file.
This caused issues when a new protobuf change was added

feat(tiller): add fromYaml to template functions

test(cmd): add unit test for chart backed by basic auth

plugins.md: Spelling fix

Ignore .idea folder for anyone using Intellij's GO IDE.

Fix Typo

fix(chartutil): improve 'missing name' error

This verifies that by adding user information in the chart repo URL
via `helm repo add`, it will be attached to the request when downloading
the chart tarball and provenance file.

fix(tller): allow deep merge of global maps