- removed unneccessary PollingDelayFilter
- improved implementation of the BroadcasterCache
- Bugfix: during a reconnect, the Broadcaster is emtpy and no messages
where broadcasted and therefore these messages could not be cached and
were lost. Now all status updates are broadcasted. The Atmosphere
framework decides wether the update is directly broadcasted (when there
are clients available) or it is cached (when there are no clients
available) or nothing happens (when the broadcaster got destroyed
because it has been idle for at least 5 minutes)