2.0.0-RC5 release preparations

[akarnokd]

Version 2.0.0-RC5 - October 21, 2016 (Maven)

This release contains API fixes, further cleanups to code and javadoc, better test coverage and bugfixes. Thanks to the respective contributors and @JakeWharton for the reviews.

API enhancements

• Pull 4685: Test static from methods and add Maybe.fromSingle & fromCompletable
• Pull 4687: Add Observable.rangeLong & Flowable.rangeLong.
• Pull 4690: BaseTestConsumer add assertValueAt(index, Predicate<T>).
• Pull 4711: Decouple stream operators from Function interface (FlowableOperator and co).
• Pull 4712: make Observable.sequenceEqual return Single
• Pull 4714: have Flowable.toList(Callable) return Single
• Pull 4720: remove variance from the input source of retryWhen
• Pull 4723: remove flatMapIterable(Function, int) overload and have flatMapIterable(Function) use the flatten operator.
• Pull 4729: Merge FlowableEmitter.BackpressureMode into BackpressureStrategy
• Pull 4710: Remove checked exceptions from transformer interfaces.

Performance enhancements

• Pull 4723: enable fusion on Observable.observeOn

Bugfixes

• Pull 4681: Fix Flowable + Single elementAt and elementAtOrError operators on empty sources.
• Pull 4686: Fix flatMapX over-cancellation in case of an inner error.
• Pull 4689: Fix doOnEvent NPE on dispose()
• Pull 4695: CompositeException fix order of exceptions
• Pull 4696: Fix inner Throwable order for CompletablePeek
• Pull 4705: fix Observable.flatMap's dispose behavior and error accumulation
• Pull 4707: Fix Flowable.elementAt on empty sources.
• Pull 4708: fix Observable.publish(Function) latecommer behavior
• Pull 4712: fix Observable.combineLatest error management, fix Observable.flatMap maxConcurrency behavior with scalars, use of unbounded queue, fix Observable.timeInterval not saving the Disposable
• Pull 4723: fix fusion of Observable.just, fix Observable.replay() potential emission before onSubscribe call
• Pull 4731: Delegate null Collections down to onError in toList
• Pull 4736: fix onBackpressureBuffer(long, Action, BufferOverflowStrategy) return type, fix concatMapDelayError wrong barrier mode selected.
• Pull 4738: Fix Flowable.flatMap error, cancellation and resource management.

Removals

• Pull 4689: Remove Maybe.toCompletable, use Maybe.ignoreElement.
• Pull 4708: remove bufferSize overloads of Observable.publish as there is no need to buffer anything for an Observable
• Pull 4723: remove flatMapIterable(Function, int) overload

Other

• Pull 4682: Update Mockito to 2.1.0
• Pull 4699: Clean up null usages by using ObjectHelper.requireNonNull.

[akarnokd]

Closing via https://github.com/ReactiveX/RxJava/releases/tag/v2.0.0-RC5