Shift-Option-I now selects the next actor and edits initiative

~~resolve #4  in SHA 005adf6~~
resolve #3  in SHA fb0973a
resolve #6  in SHA c9d138a
resolve #5  in SHA c9d138a
resolve #4 in SHA b9e4963a99f881fc94eddbf74bc27b33b01cb5be
Perhaps move the empty condition into a new method on Actor (`:hasNoInitiative?`)  then `_.find` and select, rather than iteration here?

Then this method gets nice and tidy (untested):
```
var target = _.find(  Actors, function(actor) { actor.hasNoInitiative(); } ;
Actors.setSelected(target);
```

This has the advantage of not updating the model a bunch of times, too, as we move through the Actors list.