Replace cross package panic with error return.

Allow unauthenticated requests to GCS for public buckets

First set of changes for persistent repository.

fix typo

Fix bug in Docker builds.

Fixed go vet and golint errors.

add test targets in makefiles to run local tests

Replace license text with placeholder.

This fixes #220.

feat(chart): Add a chart/ package.

Add Travis badge

use --registry flag consistently for getting templates / creating registries

* before running tests

This commit adds a target called setup-gotools which will download and
install golint and go vet. A developer who wants to run tests for an
individual component (manager, resourcifier, expandybird) can run `make
test` to run golint, vet, and test and in that directory. On first run,
a developer will want to run `make setup-gotools` so that they have
golint and vet to use locally.

There is a `make test` command in each component because running tests
from the root directory will result in lots of output. Running tests in
individual components will help isolate the tests for the component that
is being modified and result in more clear output.

add structure for [lint,vet,test-unit] all wrapped up
by the test target

Add ObjectStorage (and GCS implementation) as a registry provider

Add GCS as a registry provider. Add a way to get a file using credentials from a registry to support private repos. Add ability to create / update a registry through manager

This refactors the Chart to be a struct that can have numerous
properties and methods. Now, a chartLoader implements the
loading and closing of charts.

add info target in makefiles

The url package adds short, long, and local URL parsing.

It also supports switching between short and long names.

Best commit message ever.