Re: [fetch] XHR option to trigger busy indicators (#19)

Well it's tad bit more complicated, but you're right, it's not as bad as I though it would be:

```javascript
$rootScope.$on('$stateChangeStart', function() {
 addBusyPromise(new Promise(resolve => {
  $rootScope.on('$viewContentLoaded', resolve);
  $rootScope.on('$stateChangeError', resolve);
 }));
});
```

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https://github.com/whatwg/fetch/issues/19#issuecomment-118956284