[master] Fix for https://java.net/jira/browse/GRIZZLY-1610 (Re-work npn/http/spdy integration now that FilterChains can be dynamically modified at runtime.)
[master] + implement improvement #1612
https://java.net/jira/browse/GRIZZLY-1612

"Optimize HTTP header value serialization"
[master] + implement improvement #1613
https://java.net/jira/browse/GRIZZLY-1613

"Optimize Date header serialization"