Moved to atomic field updaters.
Add zip(iterable, selector) to RxScala; resolve the issue of zipWithIndex; update CompletenessTest.scala
Rename to 'zipWith';  add 'zip(iterable)'; add examples
ZipIterable unsubscription fix.
Changed lazySet to regular volatile write to avoid potential visibility issues.
Make the chunk_test.clj work again for now
Fix the bug that BlockingObservable.singleOrDefault doesn't call unsubscribe
Merge pull request #1246 from akarnokd/AtomicReferencesToFieldUpdaters

Moved to atomic field updaters.
Merge pull request #1254 from akarnokd/ZipWithIterableFix

Merge pull request #1254
Merge pull request #1247 from zsxwing/zip-iterable

Merge pull request #1247
Merge pull request #1260 from zsxwing/bo-singleOrDefault-bug

Merge pull request #1260
Add publishLast to RxScala
Add unsafeSubscribe to RxScala
Add unsubscribeOn to RxScala
Add share to RxScala
Add parallelMerge to RxScala
Add debounce variant to RxScala
Add toBlocking to RxScala and deprecate toBlockingObservable
Add timer variants to RxScala
Add amb variant to RxScala