ReactiveX / rxjs / 4594

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travis-ci

fix(first): unsubscription logic properly called on complete and error (#2463)

Force unsubscription logic when operator completes or errors, so
that source Observable is only subscribed as long as it has to,
even when combined with operators that do not immediately unsubscribe
from 'first' when it completes or errors.

Closes #2455

BREAKING CHANGE: unsubscription cadence has changed for `first`, this means side-effects related to unsubscription may occur at a different time than in previous versions.

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