* fix(helm): add TLS params back

During a recent refactor, several TLS flags stopped being processed for
a few of the commands. This fixes those commands, and documents how to
set up TLS.

* fix(tiller): add stricter certificate verification

The older version of Tiller allowed a weaker set of certificate checks
than we intended. This version requires a client certificate, and then
requires that that certificate be signed by a known CA. This works
around the situation where a user could provide a self-signed
certificate.

Update related.md with new helm-github plugin

Add helm-github plugin to list in documentation

Update best practices on imagePullPolicy

Add previous namespace mismatch warning

Setting the value of `imagePullPolicy` should be aligned to what `helm create` does

fix(helm): home env not set on Windows

When setting $HELM_HOME, only $HOME was considered. This variable is not always present on Windows.

docs(helm): Correct --set to --override in helm init example

fix(tiller): upgrade last deployed release

Fixes #2437

Two bugs were causing this behavior

- Tiller was marking the previous release superseded when an upgrade
failed.
- Upgrade was diffing against failed releases

Documentation on RBAC privileges needed for a helm client

use the latest version of Go/Glide

feat(helm): adding kubeconfig flag

Fix for relative chart path support in index.yaml

use 127.0.0.1 instead of localhost

fix(docs): fix code comment for ReuseValues()

Update related.md

Add helm-gcs plugin

feat(tiller): exposes port 44135 in tiller deployment

feat(helm): Automatically execute helm dep up when charts are in requirements.yaml but not in charts

Tiller exposes probes and metrics in 44135. Because tiller doesn't expose that port and does not contain any Prometheus annotations, making Prometheus scrape tiller is a bit more complex.

Closes #2985

feat(helm): Add a flag --dep-up that helm install will automatically execute helm dep up when charts are in requirements.yaml but not in charts

If checkdependencies returns an error, we can start download the
charts which are not in charts.

Closes #2879

docs(chart): add notes regarding `.helmignore` and `.Files`

docs(templates): fix misleading/broken examples

Allow to specify socket for rudder grpc server

feat(search): Expose AppVersion in search results

Fix typo for --service-account