0.11-rc: select

• 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.