Bump to v1.0.0

There are no changes since v0.9.999; however, we've been using this for
a while now in production and haven't run into any bugs or critical
missing features.

Bump to v0.9.999

Bump to v0.9.99

Update package.json

* Set version to 0.9.9, which is what we'll release with
* Make tagline consistent with README