initial work on cluster
scafoldding
prototype 2
3rd draft
first working prototype of child process and cluster forking
fix worker queue
do not detached
use SIGHUP
fix child prcess signal handling
fix signal sending, add tick declaration in run.php
add ticks to install script, fix typo
remove signal handler for SIGKILL
use pcntl_signal_dispatch
call pcntl_signal_dispatch once
use child process to handle all signals
remove redudant signal dispatch call