[pivotal-cli] Initial test commit for command line tool for node-pivotal

# pivotal-cli

## Caution

This is a pull request test.
This pull request doesn't deserve to merge.

## What's this?

command line tool for node-pivotal.

## ref

Feature: cli tool/shell · Issue #21 · Wizcorp/node-pivotal
https://github.com/Wizcorp/node-pivotal/issues/21