Library to easily make forms offline-capable

There should be an easy way to hook a form's `onSubmit` to a small library that checks if you are offline and if so, writes the data to localstorage and submits when back online.

Should be really easy to create a custom UI response for the offline use case. Also needs to provide an observable or similar per form to inform the application code when the data gets sent.

Inspired by .
See .