MULTI-SKIM!

- Replaced cuttlefish with multi-fs.
- Removed the dependency on mcouch; restructured signficantly.
- Added bunyan logging output for more diagnosible logs.
- Added 'log' events to emit debugging information.
- Switched from tap testing to lab testing.
- Expanded the tests somewhat & based them on a couchdb snapshot starting point.
- Tweaked command-line options slightly.
- Added semicolons like a stodgy person.

This work depends on the version of multi-fs in this pull-request: https://github.com/npm/multi-fs/pull/1

Until that PR is merged, you will need to clone that repo & npm link in order to make this branch run.