Fixes COMETD-493 (Document the new Oort multicast parameters).
Fixes COMETD-479 (Document new "stickyReconnect" option).
Converted <section> to <simplesect> to avoid chunking.
COMETD-497 (Document browser cookie options).
Updated version to 2.8.0.
Added Google Analytics tracking code for docs.cometd.org.
Clarified usage of the "oort.secret" parameter.
COMETD-496 - Document client-side message acknowledgment.

Updated the JavaScript sections.
COMETD-496 - Document client-side message acknowledgment.

Updated the Java sections.