Value Changed Error Message

[jachin]

After shipping 0.17.1, in Sentry I started to notice errors that looked like this

In single select mode we are expecting a single value, instead we got 2

Taking a closer look at things, the JavaScript was doing a check that it should not need to any more.

The valueChangedHandler was worried about whether we were in mulit-select mode and if it was the initial value. We're taking care of that logic in Elm now which should be the single source of truth on that stuff.

So let's just remove those checks

I also found some broken example in the site which I fixed too.

Also I added some follow up issues:

• _emitBlurOrUnfocusedValueChanged should be in the Elm #221
• on changed outgoing port should include an isValid flag #222

These are related bit of logic that should be tracked in Elm too and should just be handed out to the JavaScript.