0.20

• Migrated to Kotlin 1.2.0.
• Channels:
  • Sequence-like filter, map, etc extensions on ReceiveChannel are introduced (see #88 by @fvasco and #69 by @konrad-kaminski).
  • Introduced ReceiveChannel.cancel method.
  • All operators on ReceiveChannel fully consume the original channel (cancel it when they are done) using a helper consume extension.
  • Deprecated ActorJob and ProducerJob; actor now returns SendChannel and produce returns ReceiveChannel (see #127).
  • SendChannel.sendBlocking extension method (see #157 by @fvasco).
• Parent-child relations between coroutines:
  • Introduced an optional parent job parameter for all coroutine builders so that code with an explict parent Job is more natural.
  • Added parent parameter to CompletableDeferred constructor.
  • Introduced Job.children property.
  • Job.cancelChildren is now an extension (member is deprecated and hidden).
  • Job.joinChildren extension is introduced.
  • Deprecated Job.attachChild as a error-prone API.
  • Fixed StackOverflow when waiting for a lot of completed children that did not remove their handlers from the parent.
• Use java.util.ServiceLoader to find default instances of CoroutineExceptionHandler.
• Android UI integration:
  • Use Thread.getUncaughtExceptionPreHandler to make sure that exceptions are logged before crash (see #148).
  • Introduce UI.awaitFrame for animation; added sample coroutine-based animation application for Android here.
  • Fixed delay(Long.MAX_VALUE) (see #161)
• Added missing DefaultDispatcher on some reactive operators (see #174 by @fvasco)
• Fixed actor and produce so that a cancellation of a Job cancels the underlying channel (closes and removes all the pending messages).
• Fixed sporadic failure of example-context-06 (see #160)
• Fixed hang of Job.start on lazy coroutine with attached invokeOnCompletion handler.
• A more gradual introduction to runBlocking and coroutines in the guide (see #166).