* Adding _push_stream_longpolling_connection_ttl_ directive to be possible use different values for timeout of stream and long polling subscribers on the same location
* Adding _push_stream_max_subscribers_per_channel_ directive to limit the number of subscribers per channel
* Enabling some directives to be used on location context, now this works as expected
** push_stream_ping_message_interval
** push_stream_subscriber_connection_ttl
* Replace ping and disconnect routines by individual timers in each request, it make disconnect timeout more accurate
* Finalizing failed connections on sending messages or ping to subscribers, it prevent leak of writing connections using HTTPS
* Fixing delivery message when etag from newer message is lower than an old message
* Fixing cleanup messages when only use max_messages_stored_per_channel directive
* Fixing bug on ping and disconnect timers behavior when working with long polling subscribers
* Fixing bug on init and exit worker to execute module code only on SINGLE or WORKER process, to be possible use the module and proxy cache on the same nginx
The maximum number of subscribers accepted per channel. If you do not want to limit number of subscribers access to channels, just not set this directive.