avoiding segmentation fault by access a null reference on a tree node, after be removed by another worker

fix to not lose shared memory content after reload the server changing the shared memory size, has to do a reload to change the size

adding the channel to a queue to be easier, faster and stable go through all channels when looking for those ready to be discarded

changing the syntax of calls to ngx_rbtree_delete and ngx_rbtree_insert methods, to not use type casting

simplifying method ngx_rbtree_generic_insert to use same logic of *_rbtree_insert_value nginx methods

adding function dateToUTCString to ensure two digits on date, the toUTCString function on Date class not ensure that on all browsers

copying pushstream.js to a temporary dir without the function encapsulation, to all functions be available on tests

fix to send close connection immediately when an error happens writting to socket, bug introduced on last commit of May 13, 2012 which sends NGX_OK for connections with NGX_AGAIN writing retturn code

adding last_activity_time to channel, to only delete it after is without messages and subscribers, and after 30 seconds of inactivity

fix memory leak when recovering channel from trash, wrongly reinitializing workers_with_subscribers queue

setting default value to message_ttl as 30 minutes to avoid memory leak when stored is on and message_ttl was not configured

change use of ngx_http_finalize_request on ngx_http_push_stream_send_response_finalize function to run cleanup connection properly

adding a way to pass extra parameters in subscriber url, the extraParams function will be called before each connection to server

Added a End of batch flag for client of pushtream.js to know when it is finished receiving a long polling batch. End of batch flag is set to true for all transport except long polling  when the client can receive a batch of messages at once in between 2 long polling request. This is to help client pushstream.js to implement some filter logic at batch level (for example discard stale messages)

 enable push stream client to use 443 as non ssl port to prevent caching that occurs on some proxies on 80 port