Preliminary CLI support for `create` and `--help`.

Refs #2962
Add more robust help.

Refs #2962
Remove errant comment.
Start on a unit test harness for node.
Implement `vwf create` and add mocha tests.

Refs #2962
Update shrinkwrap with the new modules.
Add vwf run as a command.

Refs #2962
Merge pull request #84 from virtual-world-framework/branch/vwf-create-cli

As a developer, I want a command-line interface for creating VWF apps

Fixes #2962