Fixes COMETD-471 (Improve documentation on Tomcat deployment).
Updated docbook dependencies versions.
Fixes COMETD-429 (Document how to enable debug logging).
Improved navigation tables style.
Fixes COMETD-437 (Document cometd.resubscribe(subscription)).
Fixed images path.
Fixes COMETD-423 (Document new "jsonContext" parameter).
Fixes COMETD-436 (Document JSONContext.[Client|Server] getParser() /
getGenerator()).