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>

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

Update download links to 2.8.1 binaries

Fix 'Namesapce' typo

Add Helm.NET to the list of related Helm tools

chore(README): add ref to helm mailing list

Typo once/one

fix the bug in test code  that leaves behind temp directories during build

fix(helm): fix the bug in test code 'cmd/helm/create_test.go' that leaves behind temp directories during build

    The build process no longer leaves behind 'helm-create-*' temp directories.
Signed-off-by: Arash Deshmeh <adeshmeh@ca.ibm.com>

fix a typo in client

feat(helm): add --template flag to `helm version` 

`helm version --template` prints the client and server version info in
the provided template format.

minor docs change: change child-parent title & links to fix links

Update charts_tips_and_tricks.md

https://github.com/kubernetes/helm/pull/3183 added a keepalive to the Helm client of 30s period, while Tiller was never configured to permit this, keeping the default minimum keepalive period of 5 minutes, disconnecting any clients which ping more regularly than this.

This commit enforces a minimum that is lower than what Helm is configured for, preventing these disconnections, and thus fixes #3409.