queuepromise.js

.factory('QueuePromise', function($q) {
  var lastPromise = $q(function(success, error) {
    success();
  });
  return function(f) {
    var lPromise = lastPromise;
    lastPromise = $q(function(success, error) {
      lPromise['finally'](function() {
        f().then(success, error);
      });
    });
    return lastPromise;
  };
})