change AMQP codec field type 'b' interpretation
from unsigned to signed, in compliance with the spec and most
clients.
Update copyright for 2014
Merge bug 25940
Merge bug25374
Ignore NotSupportedException thrown by BufferedStream#WriteByte in Connection#Close

The issue is a buffered stream implementation aspect which results in a confusing
exception for the user. Because we are shutting down anyway, simply ignore it.
junk bug25046