Closes #1482

This adds the {{.Capabilities}} object to the template variables so that
chart authors can write charts that are aware of teh Kubernetes
capabilities of the current cluster.

Closes #1608

`helm status -h` now shows what kind of information is displayed when
running `helm status`

This fixes two things:

1) CoreOS Linux is now Container Linux https://coreos.com/blog/tectonic-self-driving.html#coreos-linux-is-now-container-linux

2) Provide more technical details on what is going on for users trying
to debug and understand

It links to install.yaml instead of install.md: https://github.com/kubernetes/helm/blob/master/docs/install.md

This documents an issue reported in Slack that turned out to be related
to security configuration in Kubernetes.

The upper limit for a chart name is 63 characters now instead of
14 or 24 in older versions of Kubernetes. This replaces `trunc 24`
in the example chart provided to `trunc 63` to reflect the new
length available.

Closes #1637

The upper limit for a chart name is 54 characters now instead of
14 or 24 in older versions of Kubernetes. This replaces `trunc 24`
in the example chart provided to `trunc 54` to reflect the new
length available.

Closes #1637

Fixed a small typo in the quickstart guide. Change 'upgrade' to
'upgraded' to match tense.

This adds a link to the Go template docs regarding whitespace.

This verifies that by adding user information in the chart repo URL
via `helm repo add`, it will be attached to the request when downloading
the chart tarball and provenance file.

Adds `--tiller-namespace` flag and `TILLER_NAMESPACE` envvar
to use tiller in an alternate namespace.

closes #1418

New properties are available to template developers.

Closes #1554

Closes #1630

This adds tests for setupEnv, and also updates some documentation to
mirror the current state of plugins.