Upgrade poms, service, classes and web.xml configuration
Upgrade cometd servlet
Fix class cast exception by using map between clients' exo_id and cometd_id, deprecate EXoContinuationClient.
Activate WS transport on the server.
Remove old cometd dependency and correct web.xml of cometd webapp
Apply cometd javascript api and make exo cometd configurable
Use AsyncJSONTransport instead of old json transports
Allow multiple tab for cometd
Using oort and seti for supporting cluster with cometd
Support cometd in multi tenant environment