Added Autosave (more Testing Needed)

From the documentatation:

When the user opens a form, she was previously editing and an autosaved state is present she will see a message indicating that there is an autosaved state and will be offered the ability to resume the editing or discard the autosaved states

Autosave is saving something, somewhere:

Let’s see what happens when I navigate away (without submitting). Pressing the browser back button, then returning. Nada. Closing the tab, then reopening:

Looks good, but more testing needed. That said, I haven’t encountered problems. That I noticd.