Support for $http promises in autocomplete

[mbenford]

It would be nice if the autocomplete directive supported $http promises in addition to regular ones, so the following code would work:

$scope.loadItems = function(query) {
    return $http.get('/tags?query?=' + query);
}

Currently some boilerplate code is needed to achieve the same result:

$scope.loadItems = function(query) {
    return $http.get('/tags?query?=' + query).then(function(response) {
        return response.data;
    }
}