Limit cross builds to linux/amd64 linux/386 darwin/amd64

closes #1214

This implements a new index file format for repository indices. It also
implements a new format for requirements.yaml.

Breaking change: This will break all previous versions of Helm, and will
impact helm search, repo, serve, and fetch functions.

Closes #1197

This starts with #1211 and does the other updates necessary for
bumping us to Kubernetes 1.4.

The Makefile has clean task that was failing when the ./rootfs/tiller
was not present

* Add README and License files to archive
* Compress archives for smaller download size

https://github.com/kubernetes/helm/issues/999

As of docker 1.10, `-f` has been removed as an option for `docker tag`

https://docs.docker.com/engine/deprecated/

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

Closes #670

See #647

Still needs a dockerfile

/cc @michelleN

This is good for running a quick test during dev to check for failures
without having to read a gazillion lines of output.

go get -u is used to install and handle the other dependencies,
such as gox, golint, and vet. Use the same method for Glide.

flake8 support was recently added, but the bootstrap didn't check or
install it.

Also, prompt the user to run pip install during bootstrap.

Closes #362.

This modifies the startup and initial handling of the REST API to make
it modular, remove the init() methods, and remove reliance on global
vars.

because you know, go vender n'stuff