Delete old deps after chart deps are updated

feat(tiller): sort manifests alphabetically if they are same kind

Remove length check from subsort test. Add check for unknowns.

Updates Tiller manifest sorting so that manifests of the same kind are
then sorted alphabetically.

Closes #1696

Fix the default NOTES.txt and values.yaml

Fix Typo in Contributing Guidelines

Add nebril to OWNERS

This change changes the order of operations in
pkg/downloader.Manager.downloadAll

Old charts are moved to tmp directory which is restored in case any
dependency update fails. Otherwise tmp dir is deleted.

updated pullpolicy example

Unsupported value: "alwaysPull": supported values: Always, IfNotPresent, Never

chore(docs): add guide for service accounts

feat(helm):use a variable for labels to get tiller pod

Redefine the err variable in NewChartRepository, otherwise errors migh slip through

fix(pkg/strvals): preserve leading zeros in vals

Add link to wheel.

Updating default values.yaml comments

Add godoc reference badge

Add requirements.yaml to Charts file structure

* delete secret when helm reset

* add test

* expected 3 actions

* closes #2224

docs(helm): Fix docs spelling error

docs: add helm-edit plugin

Fix link in provenance.md

Update README to point to #charts channel on slack too

Update helm binary references to v2.5.1

Add jascott1 as maintainer and reviewer