Start of CometD 3.x work, updated Jetty version to 9.0.x.
Start of CometD 3.x work, updated Jetty version to 9.0.x.

ghoullier/cometd,ghoullier/cometd,cometd/cometd,cometd/cometd,cometd/cometd,ghoullier/cometd,cometd/cometd