fix bug in watch_bg_command

fix bug in returncode

fix bug in run_command

fix bug in kill_process

return returncode

update proc kill 2

update proc kill

remove debug print

fix bug (add return in cleanup); add kill proc route; add return pid

add run_bg and wait_bg; fix bug in multi-proc; add kill proc

update readme

add .gitignore

update dependencies

update readme

update upload