[master] + fix issue #1644
https://java.net/jira/browse/GRIZZLY-1644

"CTS test getContentTypeNull2Test fails"

+ unit test added
[master] + minor logging cleanup
[master]  + fix issue #1645
https://java.net/jira/browse/GRIZZLY-1645

"IdleTimeoutFilter racing"
[master] + fix issue #1639
https://java.net/jira/browse/GRIZZLY-1639

"Remove NetworkListener -> TCPNIOTransport dependency"