Add graceful shutdown handler
Add listener support to the graceful shutdown handler
UNDERTOW-149 Don't register the default servlet if it is already registered

This also allows Wildfly to install it manually, and setup other mappings.
Fix issue with web socket request parameters
Change the HTTP upgrade API to make it more intuitive
Change the way the web socket handshake works to allow alternate web socket implementations to be used
Fix duplicate chain::doFilter.
[UNDERTOW-37] Adjust existing tests so that multiple authentication mechanisms can be supplied during a test.
[UNDERTOW-141] Add a test case to test SPNEGO with a fallback to BASIC authentication.
[UNDERTOW-142] Add testing for SPNEGO with fall-back to DIGEST based authentication.
[UNDERTOW-37] Bytes dropped if expected character sequence not found.
Don't run SPNEGO tests under AJP

Not sure why these are failing
Fix issue with AJP client attachments
@Ignore SpnegoBasicAuthenticationTestCase for now
@Ignore all Spnego tests for now, as they intermittently fail with -Pproxy
Add isUpgradeSupported() to the connection
More UNDERTOW-151 ignores
Fix potential NPE
Xnio 3.2.0.Beta3
Fix the write listener in the framing code