Allow a direct write into channel without passing through a select() :
o We now pass a WriteRequest through the chain, to store the original message
o Removed the lastWriteRequest field in AbstractIoSession : we don't need it anymore.
o Renamed the highLevelMessage field to originalMessage in DefaultWriteRequest
o Added some setters in DefaultWriteRequest
o Added a writeDirect( message ) in IoSession (todo : check if it's a good idea to have it in the interface...)
o Fixed the tests accordingly to those changes


git-svn-id: https://svn.apache.org/repos/asf/mina/mina/trunk@1430287 13f79535-47bb-0310-9956-ffa450edef68