Remove publishLast, publish(initialValue)?

[benjchristensen]

Should we remove the publishLast and publish(initialValue) methods?

They are easily handled by composing takeLast and concat with publish.

/cc @headinthebox

They don't need AsyncSubject or BehaviorSubject with multicast to work:

    public final ConnectableObservable<T> publishLast() {
        return takeLast(1).publish();
    }

    public final ConnectableObservable<T> publish(final T initialValue) {
        return concatWith(just(initialValue)).publish();
    }

Prior to #1779 they were using multicast with subjects.

[benjchristensen]

Pull request if we agree -> #1788

[benjchristensen]

@headinthebox and I reviewed and agreed. The methods are removed.