enable shrinkwrapping by removing chokidar

This needs further discussion before merging.

Perhaps this can be blamed on how new I am to node, but I'm relying on shrinkwrapping as part of my deployment process. `chokidar` is known to muck this up, and I'm not aware of a workaround. I also don't see the need for a filesystem watcher in a production environment, and so I'd like to propose that `chokidar` be moved from core into [derby-starter](http://github.com/codeparty/derby-starter).

I do absolutely love a good `fs.watch` in development and understand why chokidar may be necessary for cross-platform consistency.

Sorry about the whitespace cruft; my setup trims trailing whitespace automatically and I forgot to `git diff --staged` before the first commit.