[Tech Debt]: started the CLI work for PR#49

This pull requests includes the very basic work to start end-to-end testing the arithmetic CLI integration

https://github.com/jspm/jspm-cli/issues/49
so it's it cool if I create a bundle.js in lib and require it in (from core) ? if so -are you ok w/ the extract and transform methods or do you prefer those are a single method inside the new bundle? also what is the entry point from your POV (for bundle.js)