v1.0.0 - RC0

This is a work-in-progress release of #34. Docs updates are coming next - so the README is not up-to-date.

For simple device IDs and page tracking the highlights are:

<script src="ravelin-core+track+promise.min.js"></script>
<script>var r = new Ravelin({key: "publishable_key_..."});</script>

after which you can then read the deviceId from the ravelinDeviceId cookie (asynchronously written) or r.core.id() which returns a Promise. Be sure to send the device: {deviceId: ...} with the order in the back-end request.