[2.3.x] make sure initial OP_READ is registered only once after Connection is established. So if OP_READ was explicitly enabled in user code during initialization - Grizzly won't try to register OP_READ again
[2.3.x] + fix the issue #1724
https://java.net/jira/browse/GRIZZLY-1724
"Extend Closeable interface"
[2.3.x] + fix the issue #1725
https://java.net/jira/browse/GRIZZLY-1725
"Associated Closeable with FilterChain processing"
[2.3.x] + fix the issue #1723
https://java.net/jira/browse/GRIZZLY-1723
"Create Connection.getMemoryManager() shortcut to Connection.getTransport().getMemoryManager()"
[2.3.x] fix the copyright