Add stubbed out CLI

Wrapper for CLI. This adds 3 commands: `harness dev`, `harness test`, and `harness deploy`. These command should delegate to the workflow that exists in the Makefile, and the old Makefile tasks should get removed, since usage will be through the CLI and not make. 

You can try it out by checking out this add-cli branch, then run `npm link`. Create another random directory run `npm link harness`. Then you should be able to test the harness commands from within the new directory.