Updating npm metadata

Just updating the metadata, which for the time being we can publish by bumping the patch version.

After pulling this, `npm version` is a handy way of bumping the package version and creating a tag.

```sh
$ npm version patch
# bumps package.json version to 0.4.2, tagging "v0.4.2"
$ git push --tags origin master
$ npm publish
```

For the last line, I'll need to add you to the owners.