Charts should not require a values.toml file -- some charts will just be
manifests with nothing configurable.

Included a link to 12factor.net

Fix for dead link

Not every one is aware of the 12factor.net so included the link.

Updated the link which was dead pointing to `https://github.com/deis/charts`

ref(helm): add default repository on init step

... so we don't rely on external services
in unit tests :)

See #718

docs(chart): updated chart documentation

fix(style): cleanup coding style on error returns

feat(tunnel): wire in the tunnel setup and teardown

feat(tunnel): add logic for detecting tiller pod

feat(kube): create tunnel for client

fix(proto): let chart take multiple Files.

ref(helm): fix chart url in index file

Update quickstart.md

feat(helm): generate index file in given directory with given url

fix(helm): fix search bugs

fix(helm): fix output of helm package command

fix(tiller): stop returning deleted releases for list

fix(chart): change source to sources in chart file

fix(tiller): fix startup output

fix(glide): use https instead of git protocol

A two-character pull request.

As a carryover from the days when we only allowed one source, the source
field was still labeled 'source' instead of 'sources'. Fixed and updated
all of the tests.

This fixes three things:
- #741 output is wrong
- #743 nil pointer error because of unchecked error
- Printing "Chart:" string in output