Fix subchart2 example tag

docs: fixed incorrect clone path in developer docs

refs #3173: add appsv1beta1 and appsv1beta2 apiVersion 

fix doc some spell check

Disambiguate encoding from secrets

the spell check

Update RBAC best practices

exit zero on non-master branch

Fix release checklist

Fix typo

While we still don't want to upload to GCS/GCR, we also don't want the CI run to fail because we are just skipping the step. This is most usually seen in the `release-X.Y` branches cut every minor release.

also add it to the release checklist.

the release branch was of the format `release-vX.Y.Z` when it should be `release-X.Y`.

bump version to v2.8.0

(cherry picked from commit 14af25f1)

In docs/developers.md the clone path for helm was given as $GOPATH/k8s.io.
This has been changed to $GOPATH/src/k8s.io.

Closes #3387

fix link to image

Added k8comp plugin for helm

helm template: display the default value of --kube-version in help message

This commit improves to display the default value of --kube-version in
help message of `helm template` command.

```
--kube-version string    kubernetes version used as Capabilities.KubeVersion.Major/Minor (default "1.9")
```

Adding mattfarina to the OWNERS file

fix(ci): install zip

feat Making starter templates more versatile

Add helm-monitor plugin

fix(capabilities): Adding GitVersion to default set

Added a --wait flag to helm init

Added a --wait flag for helm init which pings the Tiller server and ensures that it is ready to receive requests
Fixes #2114
Signed-off-by: Alex Johnson <ajohnson@bombora.com>