add recev funciton
delete reliable_sender

don't commit exec
debug
debug
debug
debug
debug
debuf
try to add info in front of buffer
add sender
Merge branch 'eric_work' of https://github.com/eric810905/stransportor into eric_work

Conflicts:
	sender_main.c
merge sender
sender change
 allowing ack to be sent back and read
Merge branch 'master' into eric_work