Pre-release 0.1 in Series 12

• Multithreaded Actor I/O. All incoming messages are now dispatched on a
  shared thread pool, which greatly speeds the things up.
• Protocol transitions. Service protocols can now specify state transitions
  to support dispatch hierarchies. For example, storage protocol can
  implement a write_stream() method, which switches to stream protocol on
  invocation, or Chrono Service can implement a cancellable_timeout() method
  by switching to a cancellable protocol.
• App streaming interface. Clients can stream data chunks into the app now,
  as opposed to sending a single request chunk along with the enqueue()
  method invocation.
• Dropped libev in favor of Boost.ASIO.
• Logging in now handled via the Blackhole logging library.
• Locator is now a proper service, without any special treatment. Local
  service management is a responsibility of the Context.
• Configurable cluster discovery mechanics, including multicast and predefine
  cluster discovery plugins.
• Routing groups re-implemented using Ketama consistent hashing continuums.