2.0.9 release preparations

[akarnokd]

Version 2.0.9 - April 21, 2017 (Maven)

API enhancements

• Pull 5302: Add Single.unsubscribeOn().

Bugfixes

• Pull 5247: Fix Flowable.toList() onNext/cancel race.
• Pull 5256: Fix flatMapIterable appearing to be empty when fused.
• Pull 5277: Fix Single.subscribe(BiConsumer) to be consistent with isDisposed.
• Pull 5281: Fix BehaviorProcessor & BehaviorSubject terminate-subscribe race.
• Pull 5287: Fix Flowable.flatMapMaybe/Flowable.flatMapSingle maxConcurrency not requesting more.

Documentation

• Pull 5271: enable link to external JDK, fix Schedulers style.
• Pull 5286: Cleanup for text and Javadoc 04/15.
• Commit 7c95808: Fix DisposableX copy-paste error in Javadoc.
• Pull 5296: Improve doOnDispose JavaDoc.
• Pull 5297: Fix JavaDoc image for Single.flatMapObservable().
• Pull 5304: Correct documented return type of Single.flatMapObservable()'s function argument.

Other

• Pull 5255: Add NullPointerException comments and ObjectHelper test code.
• Pull 5251: More nullability annotations.
• Pull 5257: Remove @NonNull annotations from BiConsumer.
• Pull 5268: Remove commented out code from IoScheduler.
• Pull 5301: More detailed no-multi-subscribe error message with the standard consumer types (such as DisposableObserver).

[akarnokd]

Closing via 2.0.9