ReactiveX / rxjs / 5418

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feat(never): always return the same instance (#3249)

- never always returns the same Observable instance
- Remove NeverObservable
- never return value now typed as `Observable<never>` (lol)

BREAKING CHANGE: `never()` always returns the same instance
BREAKING CHANGE: TypeScript typing for `never()` is now `Observable<never>` and the function no longer requires a generic type.

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