propagate error to event bus when payload is not set with data;
updated tests to use the latest mod version;
updated kafka version to 0.8.11 with scala 2.10.4;
updated vert.x version to 2.1.1
reverted back to the original default values
added test case for sending message-specific topic to kafka
Merge pull request #2 from alanma/develop

POM dependency updates and Kafka Topic per Message Definition