Change log for kotlinx.coroutines

Version 0.11-rc

select expression with onJoin/onAwait/onSend/onReceive clauses.
Mutex is moved to kotlinx.coroutines.experimental.sync package.
ClosedSendChannelException is a subclass of CancellationException now.
New sections on "Shared mutable state and concurrency" and "Select expression" in coroutines guide.

Switched to Kotlin version 1.1.0-rc-91.
Mutex synchronization primitive is introduced.
buildChannel is renamed to produce, old name is deprecated.
Job.onCompletion is renamed to Job.invokeOnCompletion, old name is deprecated.
delay implementation in Swing, JavaFx, and scheduled executors is fixed to avoid an extra dispatch.
CancellableContinuation.resumeUndispatched is introduced to make this efficient implementation possible.
Remove unnecessary creation of CancellationException to improve performance, plus other performance improvements.
Suppress deprecated and internal APIs from docs.
Better docs at top level with categorized summary of classes and functions.

defer coroutine builder is renamed to async.
lazyDefer is deprecated, async has an optional start parameter instead.
LazyDeferred interface is deprecated, lazy start functionality is integrated into Job interface.
launch has an optional start parameter for lazily started coroutines.
Job.start and Job.isCompleted are introduced.
Deferred.isCompletedExceptionally and Deferred.isCancelled are introduced.
Job.getInactiveCancellationException is renamed to getCompletionException.
Job.join is now a member function.
Internal JobSupport state machine is enhanced to support new (not-started-yet) state. So, lazy coroutines do not need a separate state variable to track their started/not-started (new/active) status.
Exception transparency in Job.cancel (original cause is rethrown).
Clarified possible states for Job/CancellableContinuation/Deferred in docs.
Example on async-style functions and links to API reference site from coroutines guide.

Buffered and unbuffered channels are introduced: Channel, SendChannel, and ReceiveChannel interfaces, RendezvousChannel and ArrayChannel implementations, Channel() factory function and buildChannel{} coroutines builder.
Here context is renamed to Unconfined (the old name is deprecated).
A guide on coroutines is expanded: sections on contexts and channels.

Switched to Kotlin version 1.1.0-beta-22 (republished version).
Removed currentCoroutineContext and related thread-locals without replacement. Explicitly pass coroutine context around if needed.
lazyDefer(context) {...} coroutine builder and LazyDeferred interface are introduced.
The default behaviour of all coroutine dispatchers is changed to always schedule execution of new coroutine for later in this thread or thread pool. Correspondingly, CoroutineDispatcher.isDispatchNeeded function has a default implementation that returns true.
NonCancellable context is introduced.
Performance optimizations for cancellable continuations (fewer objects created).
A guide on coroutines is added.

Switched to Kotlin version 1.1.0-beta-18 (republished version).
CoroutineDispatcher methods now have context parameter.
Introduced CancellableContinuation.isCancelled
Introduced EventLoop dispatcher and made it a default for runBlocking { ... }
Introduced CoroutineScope interface with isActive and context properties; standard coroutine builders include it as receiver for convenience.
Introduced Executor.toCoroutineDispatcher() extension.
Delay scheduler thread is not daemon anymore, but times out automatically.
Debugging facilities in newCoroutineContext can be explicitly disabled with -Dkotlinx.coroutines.debug=off.
xxx-test files are renamed to xxx-example for clarity.
Fixed NPE in Job implementation when starting coroutine with already cancelled parent job.
Support cancellation in kotlinx-coroutines-nio module