ReactiveX / rxjs / 4708

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fix(never): Observable.never() Observable.empty() and .ignoreElements() now return Observable<never> (#2691)

fixes #2640

BREAKING CHANGE: Previously, `Observable.never()` `Observable.empty()`
and the `.ignoreElements()` operator all returned `Observable<T>` which
was incorrect since they actually never emit anything. Now they all
return `Observable<never>` (`never` was added in TS 2.0 as a special
type)

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