fix(Observer): observer interface now allows partial Observers#1282

Merged

benlesh merged 1 commit intoReactiveX:masterfrom benlesh:observer-interface-fix

Feb 2, 2016

+64-41

Commits on Feb 2, 2016

fix(Observer): fix typing to allow observation via partial observables with PartialObservable<T>
benlesh
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