Add script for easy install without Tiller in the cluster

For cases where Tiller is hard to install in-cluster or where security concerns outweigh the benefits of running Tiller in-cluster (see examples in #284 (closed)), this provides an easy way to run tiller locally and get the same results.

This script:

1. Starts Tiller in a local docker container
2. Provides Tiller with your personal credentials to authenticate with the Kubernetes API
3. Handles auth-providers that use token-based authentication (e.g. gcp) that Tiller doesn't support by generating a temporary configuration without the auth-provider.
4. Stops Tiller after the helm command is complete

It should be a drop-in replacement for helm.

@joshlambert