Eureka transport - discovery server.
Fix avro encoding for class hierarchy.
Refactor asynchronous transport (get rid of Message hierarchy).
Eliminate type parameters from MessageBroker framework.
Fix Json codec.
Merge pull request #164 from tbak/2.x

transport update
Transport update.
Fix race condition in transport unit test.
Merge pull request #165 from tbak/2.x

Transport update.