adding ReliableDelivery support; marking internal classes as internal
started integrating reliable delivery into the AkkaPduCodec
implementing RemoteDeliverySupervisor
added stubs for AddressTerminated, finished ReliableDeliverySupervisor
starting work on EndpointWriter; need to implement stash
added basic stash capabilities
completed EndpointWriter
finished all endpoint actors
updated supervisor strategy for RemoteEndpointManager
Merge pull request #114 from Aaronontheweb/remote-fixes

[Unstable] ReliableDeliverySupervisor, RemoteWriter, RemoteReader, Stash support
brought the RemoteTransport inline with Akka
added a basic extension system
changed the ActorSystem to load extensions via configuration
implemented extensions
exposed ActorSystemExtensions as public methods
added more convenience methods to make it easier to work with extensions
Refactored AddressUID into an extension
completed remote endpointmanager
completed remoting
Merge pull request #115 from Aaronontheweb/remote-fixes

[USTABLE] ActorSystem Extensions, Remoting, RemoteTransport, EndpointManager