Adding a default NFS mount for /Users with xhyve

This feature is enabled in v0.2.3 of the docker xhyve driver
Enabling this by default on cluster_darwin

This resolves issue #423

Update Dashboard UI to version v1.1.1

Release tag: https://github.com/kubernetes/dashboard/releases/tag/v1.1.1

Release issue: kubernetes/dashboard#1078

Remove the "kubernetes is now available" line from start.

Actually store registered etcd listeners.

Added localkube caching functionality.  Also cleanup up private/public

code to use localkube_caching.go and localkubeCacher.

functions in cluster.go, added v1.3.3 to k8s_releases.json and fixed
link in LOCALKUBE_RELEASING.md.  Fixed TestUpdatedKubernetesVersion to
use tmp dir as caching is now used for localkube.

Add warning message for failure to read conf

Add ability to specify CIDR for Virtualbox minikube

The configuration file is optional, however when/if we move more
options to be configurable through the viper yaml file, this would be
nice to see when debugging.

Don't drop errors during creation retries.

Revise readme

Configure /data as a persisted directory.

Fixing file:// uri issue for --iso-url flag

Added tests for GetLocalkubeDownloadURL

Updated k8s_releases.json to include v1.3.4 localkube release

Updated checksums in schema.json and releases.json

and checksum change in RELEASING.md.

Uprade to Kubernetes v1.3.4

Added instructions to upload localkube to GCS as part of updating kub…

Fix releasing instruction for updating latest.