add CLI and high-level Weavr interface

This change adds a high-level interface to Weavr, allowing end users
to run commands like

> stop HDFS
> wait INSTALLED HDFS
> start HDFS
adding CLI to README
adding a program to run the Weavr CLI
Merge pull request #3 from joshbronson/20141120_add_configability

20141120 add configability