0.3.0 dist depends on babelHelpers

[josh]

define(['exports', 'selector-set'], function (exports, _selectorSet) {
  'use strict';

  Object.defineProperty(exports, "__esModule", {
    value: true
  });
  exports.on = on;
  exports.off = off;
  exports.fire = fire;

  var _selectorSet2 = babelHelpers.interopRequireDefault(_selectorSet);

It looks like the generated output includes a reference to a babelHelpers helper module which github doesn't use. It shouldn't be necessary or an implicit dependency of delegated-events.

To: @dgraham