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
UNDERTOW-295: NPE fixed
Fixed ExceptionHandler tests.  It was not testing the attachment correctly.
Merge pull request #238 from ddska/master

UNDERTOW-295: NPE fixed
Merge pull request #239 from billoneil/fix-exception-handler-tests

Fixed ExceptionHandler tests.
Allow SPDY to be used without SSL
Remove recievers set from the framed channel
Only call notifyAll() if there are waiters
Checkstyle
Fix some HTTP response channel bugs
Update state when request is too large