feat(chart): support 'image:URL' in charts.

Closes #1034

add docs table of contents and update quick start

Add --set flag to `helm upgrade`

Signed-off-by: Jess Frazelle <me@jessfraz.com>

docs(notes.txt): Add NOTES.txt to Chart spec, and describe chart documentation files

feat(tiller): limit the max len of Release.Name

fix(tiller): upgrade Sprig to 2.5.0

Fix #1070

We need this specifically for trimSuffix.

Closes #1071

This limits the number of characters in a release name to 14. This
preserves 10 characters for customizing the `name:` field in charts.

Relates to #1071

feat(helm): add rollback cmd

Disable validateQuotes linter rule

simplify example container names

This encourages people from making container names depend on release
names.

Add note on installation via cask to README.

update readme example and change repository to https

Include values from both --set and --values when specified on install

Signed-off-by: Jess Frazelle <me@jessfraz.com>

fix(cmd): remove default port in cmd doc

feat(ci): run tests on go 1.7

fix(cmd): s/supress/suppress/

feat(tiller): update Sprig to 2.4.0

Suppress is spelled wrong.

Matt did it.

Default is unset.

Closes #1055

feat(tiller): make configmaps the default storage

fix(helm): document KUBECONFIG env var

Closes #1047

This adds a Tiller CLI flag to override the default, and tests to
make sure that the default comes up as expected.