Merge pull request #155 from tbak/2.x

Eureka 2.0 transport prototype.
Initial example interface/implementation of model and registry
@Ignore failing avro test for now
@Ignore all tests in AvroMessageBrokerTest for now
Merge pull request #156 from qiangdavidliu/2.x

Initial example interface/implementation of model and registry
Update registration/discovery protocol classes + verify transport compatibility.