Generate the nfo.json file from metabook.json.

The nfo.json file is no longer an input.  metabook.json is the only input
required to drive the bundler.

Change-Id: Ic451e80e60ee0a1c14bad6faf4c0fc6dd77f5ff6
Add --debug option to CLI.

Change-Id: Ia83510609fd9e901e53093cc4d339307d84ef740
Add travis test runner; add test case; update dependencies.

Change-Id: If7314a4db3f1c212ad1ccc7f60fc3df111c4b5ea