2.1.2 release preparations

[akarnokd]

Version 2.1.2 - July 23, 2017 (Maven)

Documentation changes

• Pull 5432: Fix/clarify the Observable class' javadoc.
• Pull 5444: Fix wording in Async and Publish processors javadoc.
• Pull 5413: Add empty source clauses to javadocs of combineLatest operators accepting unspecified number of sources.
• Pull 5465: Fix wording of toList, fix a/an in subscribeOn.
• Pull 5476: Fix Javadoc for Flowable and Observable reduce.
• Pull 5478: Corrected return type in doc for F.reduce(seed, reducer), F.reduceWith(seedSupplier, reducer) and O.reduce(seed, reducer).
• Pull 5486: Small note on Maybe.defaultIfEmpty regarding toSingle.

Bugfixes

• Pull 5434: Fix time bounded ReplaySubject.getValue() inconsistency with getValues() on old items.
• Pull 5440: concat to report isDisposed consistently with termination.
• Pull 5441: Fix periodic scheduler purging config not honored.
• Pull 5494: Fix FlowableWithLatestFrom not requesting more when the other hasn't emitted yet.
• Pull 5493: Fix ReplayProcessor backpressure and NotificationLite emission bug.
• Pull 5507: Fix GC nepotism in SpscLinkedArrayQueue.
• Pull 5511: Remove unnecessary generic type parameter for the timed Single.delaySubscription methods.

Other

• Pull 5447: Remove @NonNull annotation in Consumer method parameter.
• Pull 5449: Remove the @NonNull annotation from Function.
• Commit 4d8f008c: add missing 'the' to the changed sentences of Pull 5413
• Pull 5460: Fix Javadoc mistakes and some style.
• Pull 5466: Use a mutable field in FlowableTimeoutTimed instead of an AtomicReference.
• Commit 5d2e8fb4: Fix Schedulers.io() javadoc {link missing the @ symbol.
• Pull 5495: Make withLatestFrom conditional subscriber, test cold consumption.

[akarnokd]

Closing via https://github.com/ReactiveX/RxJava/releases/tag/v2.1.2