live stream synchronization
added auto_push module to build
added global record on/off feature
added multi-record api
implemented multiple recorder support
added manual recording flag
added recorder{} block
fixed on_record_done for multiple recorders
implemented manual record open/close by index
implemented on_publish_done, on_play_done; fixed repeated on_done
fixed crash in callback creator
moved notify module to the end of config & added auto_push checks to notifier
added publish/play/done execs
Merge branch 'multi-record'
Merge branch 'enotify'
changed execv to execvp to enable file search
fixed compilation
added on_record_done & exec_record_done for recorder{} blocks; added new-style args to exec_* notifiers
added common evaluation code
added all required arguments to old-style & new-style exec