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- Tiller was marking the previous release superseded when an upgrade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

feat(chart): Adding maintainer url

fix(circleci): Fixing the glide/vendor cache so it is used by glide

Dependencies installation doc

Add docs clarification to resolve #3046