Problem with synchronous observables.

While using your lib I found a problem with numerous warnings from React. I debugged it without using this lib and found problem and solution. I leave it here so you could take a look. https://stackoverflow.com/questions/47444581/rx-react-setstate-avoid-cannot-update-during-an-existing-state-transition/47444582#47444582

The issue names no files or tests; start by reading the linked Stack Overflow diagnosis and reproducing the React warnings with synchronous observables. Trace the library path involved and verify that the reported warnings no longer occur while the subscription behavior remains intact.

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