changed default exception handlers so they are easier to 'override' using Springs @Order-annotation.
added processor chain completion handler to let implementors add behavior after processor chain completes
added DrgMessage instance variable to DrgProcessorException
add DrgMessage to AsyncHttpClientProcessorException
run the spring mvc:annotation-driven block only when drg.no-default-annotation-driven profile is not set
[maven-release-plugin] prepare release drg-0.8.2