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

Update using_helm.md

This commit does a few things:
* It moves the information being cached to be the glide cache.
  This will make the glide install process faster.
* The cache is restored from prior to installing the dependencies.

add version flag to tiller binary

* TODO comment on tiller.go

Update

docs: Using Helm in Openshift Kubernetes distribution

Each maintainer can have an optional URL. There are seceral use
cases for providing a URL instead of an email address:
- The case where a maintainer wants to hide their email address
  behind a webform for personal security
- When the maintainer is an organization and feedback should
  go to an issue queue

This change:
- Adds the proto field for url
- Updates the generated files for the chart proto
- Includes linting for the url
- Updates the docs to include the url

Closes #3056

docs(tiller): Adds documentation for secret backend

fix circle not building tags

CircleCI recently skipped building tags by default, so we need to
explicitly enable it.

See https://circleci.com/docs/2.0/configuration-reference/#tags

Adding documentation on $ variable scope

as requested

There must be at least one subchart or template file, therefore the `charts` and `templates` directories are not strictly optional.

Small change in README.md

There should be a colon because it precedes an explanation or an enumeration, or list.

Working on Fedora release 25 -  kubeadm v1.7.0 - kubelet v1.8.1

Tested:
- Installing/deleting Chart
- Chart upgrade and Chart rollback

Add explanation of persistence behavior of `--set`

Fix a small typo in `yaml_techniques.md`

Fix a typo: `coffess`.

fix(semver): fixed edge cases that do not match prerelease

Adds documentation for running `tiller` with the new secrets backend
added in #2721

pin golang.org/x/sys to master

fixes issues seen in master with `make build-cross` for windows

Document how to add an image pull secret in Helm

Provide an example of how to take an image registry, user name, and password and prepare a Secret that can be used by a pod to pull a protected container image.

chore(sprig): bump sprig to 2.14.0

ref(*): kubernetes v1.8 support

fix(tiller): Adds CRD ordering