Minor documentation fixes

* add test for rolling back from a FAILED deployment

* Update naming of release variables

Use same naming as the rest of the file.

* Update rollback test

- Add logging
- Verify other release names not changed

* fix(tiller): Supersede multiple deployments

There are cases when multiple revisions of a release has been
marked with DEPLOYED status. This makes sure any previous deployment
will be set to SUPERSEDED when doing rollbacks.

Closes #2941 #3513 #3275

Fix linting bug with charts containing more than one hyphen

Fix the output leak to stdout during build by tests under pkg/releasetesting

Mute upgrade --install default namespace warning

fix the output leak from test code under pkg/tiller

Fix minor typo

Clean up temporary "helm-repotest-*" directories left behind by tests under cmd/helm

Fix link to Slack

docs: Fix FromJson comment

Bump client side grpc max msg size

docs(helm): Added kubeVersion to documentation.

docs(helm): Added kubeVersion to documentation and examples.
Adjusted wording for the Chart.kubeVersion description
Removing redundant wording for Chart.kubeVersion description

use an underscore for release_checklist.md

Support installing plugins by relative path

```
helm plugins install .
```

Newer gits don't like checking out an empty string.

```
empty string is not a valid pathspec. please use . instead if you meant to match all paths
```

Tiller should only enforce what we expect from Helm

update docs to demonstrate best practices in regards to named templates

Added ReactiveOps Autohelm to the related tools list

 fix(helm): fix the bug in tests under cmd/helm that leaves behind temporary directories named "repo-test-*" during build.
Signed-off-by: Arash Deshmeh <adeshmeh@ca.ibm.com>

Signed-off-by: Arash Deshmeh <adeshmeh@ca.ibm.com>

The docs say: use DialContext instead.

Set it to match the server side, or the default limit
of 4MB will still apply when upgrading charts.

Fixes #3512

Initialize empty selection like in the install command to prevent:
WARNING: Namespace doesn't match with previous

Update download links to 2.8.1 binaries

    by redirecting output from mock clients.
Signed-off-by: Arash Deshmeh <adeshmeh@ca.ibm.com>

Fix 'Namesapce' typo

Add Helm.NET to the list of related Helm tools

chore(README): add ref to helm mailing list

Typo once/one