Added an ExceptionHandler that can dispatch requests to various HttpHandlers based on the exception type thrown.
WFLY-3722 IOException logged at to high a level
ExceptionHandler should rethrow any unmatched exceptions
UNDERTOW-293 Add more HandlerBuilders to support common use cases
Allow handlers to be chained
Add ability to get remaining path
UNDERTOW-294 Make WebSocketHttpExchange.getSession() return something useful
Exception handler now adds the exception as an attachment to the exchange
Test that the throwable attachment gets set on the ExceptionHandler
Merge pull request #237 from billoneil/feature/exception-handler

ExceptionHandler