next gen release, re-factor

1. current ios-deploy interface doesn't change
2. ability to have ios-deploy as a lib (ios-deploy-lib)
3. ability to publish ios-deploy-lib to npm as a lib with node-ffi
4. ios-deploy itself will use ios-deploy-lib
5. ios-deploy-lib source structure will have each command as a separate file
6. ios-deploy-lib will be testable

This is not a make-work re-factor. The current code-base is a huge barrier to contribution. Breaking it up allows for unit tests, and easier contribution for new commands, etc.