[2.3.x] + fix Content-Type array overflow + tests
[2.3.x] + implement improvement #1677
https://java.net/jira/browse/GRIZZLY-1677
"Improve Grizzly TaskQueue to properly shutdown tasks, when connection is getting closed asynchronously"
[2.3.x] + minor test update
[2.3.x] + implement improvement #1678
https://java.net/jira/browse/GRIZZLY-1678
"Generate only one HttpContext for client-side HTTP request/response processing"
[2.3.x] + implement improvement #1665
https://java.net/jira/browse/GRIZZLY-1665
"update SPDY version to 3.1"
[2.3.x] + fix copyright header
[2.3.x] + fix issue #1680
https://java.net/jira/browse/GRIZZLY-1680

"Grizzly 2.3.11 + Atmosphere 2.1.3: getServletPath() returns null"
[2.3.x] + fix the test
[2.3.x] + fix the test2 (don't know why NB didn't highlighted the missed import)
[2.3.x] + update the release plugin