Linter structure changes + extra chartfile rules

fix(sprig): update sprig library to 2.3.0

fix(tunnel): allow tunneling to non-default namespace

docs(developer): update developer documentation

New template functions like trunc will be really helpful for dealing
with Kubernetes naming limits.

Fixed tests

Adding chart name linter

Add lint error

Moving to blocks

Moving to method

Moved lint rules to functions

Semantic version validation

Linting engine

Adding sources and home validations

Sharing file loading

Sharing file loading

Rolling back readme

Rewriting other linters

Fixing tests

Typo

Using chart.Metadata

Fixing format

Adding UNKNOWN in Engine

Adding tabs

Fixing tabs

Closes #840

fix(proto): keep a local protoc Go plugin

This works around issues where $GOPATH/bin has a different version of
the protobuf Go plugin than the one Kubernetes uses.

fix(issue/841): capitalization and punctuation consistency.

Sorting Wildcard function

feat(helm): add 'helm get values --all' for all values

Add support for displaying computed configuration values. This is
useful for debugging.

Templates partials

fix(pkg/chart): remove pkg/chart

This is the final step in replacing pkg/chart with pkg/chartutil.

This also removes the last of the TOML code.

feat(pkg/ignore): add helmignore library

ref(pkg/helm) replace  'pkg/helm' with 'pkg/helmx'

includes:
 - (#826) removal old pkg/helm

ref(pkg/helm): package helm refactor

includes:
 - (#828) helm client grpc support ported from old pkg/helm
 - comment consistencey & style fix
 - gofmt pkg/helmx

This adds support for .helmignore files. These files roughly follow
the conventions established for .gitignore files:
https://git-scm.com/docs/gitignore

Closes #748

feat(chartutil): support global variables

fix(helm): fix two panics in 'helm search'

fix(tiller): allow different template engine

fix(helm): add 'helm repo rm' alias

ref(pkg/helm): package helm refactor

This is a minor fix to the Tiller internals to allow an alternate
template engine. This will still require future work to make it possible
to bootstrap in a different template renderer.

includes:
 - (#825) comptability interface between
          old/pkg/helm and new/pkg/helm

 - (#827) helm client scaffolding and
          rpc / release options

fix(helm): read values.yaml instead of values.toml

Closes #822