ReplaySubject subscription handler is called before it is subscribed

[ventsislav-georgiev]

RxJS version:
rxjs@5.0.0-rc.1

Code to reproduce:

let subject = new Rx.ReplaySubject();
subject.next(1);
subject.subscribe(function (data) {
  console.log(data);
  if (data < 3) { data++; subject.next(data); }
});

Expected behavior:
Output: 1, 2, 3

Actual behavior:
Output: 1

Additional information:
This works properly in RxJS v4

It seems that the issue comes from this code: https://github.com/ReactiveX/rxjs/blob/master/src/ReplaySubject.ts#L40
Where we first call the subsrcibe handler with the previous values, before we actually subscribe him for next values.

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