feat(helm): Linter validations for Chart icon property

feat(helm): allow specifying --set multiple times

bugfix(tiller): replace + with _ in "helm create" template Chart version

Logging real name of the failing hook

Http client with TLS

fix(tiller): add missing name to status response

fix(tiller): don't update purged releases

feat(tiller): add {{.Capabilities}} object

fixes #1807

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

"spring" should be "sprig"

clarifying _ files, adding syntax highlighting

fix(tests): fix testclient reactions that were not triggering

making precedence explanation less ambiguous

ref(*): remove dead code

Add `--upgrade` option to `init`. Fixes #1782.

fix(tiller): s/POD_NAMESPACE/TILLER_NAMESPACE/

Align output of helm status resources output

Improve `helm status` help text

fix(helm): prevent .helmignore rules from applying to '.'

text/tabwriter is used to align resource list in columns

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

When option is given, any existing Tiller will be upgraded to the current version

RIP

Closes #1776