sails: async controller fails to bind to routes

@mikermcneil Waiting for the fix

Making the controller function async makes it possible to await the Promises inside the controller. So I can avoid callbacks and promise then chains:

let item = await Items.findOne(req.params.id); // then do something with item

instead of

Items.findOne(req.params.id)
.then(function(item){
})
// and the chain continues