Clean hsqldb data directory
- Added gradle task to clean the data directory
  while running "clean" task on spring-xd-dirt
XD-689 - MessageBusSupport uses Kryo serialization
XD-828 renamed Bridge to Binding
XD-828 - Renamed transform- methods to  transformPayloadForConsumer and transformPayloadForProducer
XD-689 fixed a threading issue. Now new Kryo instance for each message operation
XD-689 - Refactored to extract Serializer interfaces and extend core spring De/Serializer
XD-689 renamed KyroAbstractSerializer to KryoAbstractSerializer
XD-689 - Added Codec Interfaces and DI for MessageBusSupport
XD-689: minor changes to address MF comments