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