Make ionRefresher promise-friendly

[beauby]

Make ionRefresher play ball when onRefresh function returns a promise.

[mhartington]

Do you have an example for how this change PTR? Also, could you provide a test for this?

[beauby]

Here is an example:

var myRefreshFunction = function() {
  return fetchNewData();
};

instead of

var myRefreshFunction = function() {
  fetchNewData().finally(function() {
    $scope.$broadcast('scroll.refreshComplete');
  });
};

Note that this commit PR is backwards compatible.

[markspolakovs]

👍

[ryanlin1986]

This is really good.

[mhartington]

I'll let @perrygovier take a look at this.

[beauby]

Any feedback on this one?

[mlynch]

👍 🍕 🍻