alpha.38: The actual type of QueryList<T>.changes is EventEmitter

So the [changelog](https://github.com/angular/angular/blob/master/CHANGELOG.md#breaking-changes) and [the jsdoc of `QueryList`](https://github.com/angular/angular/blob/master/modules/angular2/src/core/linker/query_list.ts#L25) is misleading, `changes` does not have the `subscribe` method.
