Basic Sender(with alarm)&Receiver,NO file transfer
Stop and wait:client and alarm server finished
Stop and wait:'select' server finished,add 'eater'

eater is for testing purpose, just eat all UDP packet
Stop and wait:'set socket option' server finished
Hw2 release patch (basic version)
Very Fast GBN (8000 packet per send) for sockOpt.

later will apply to other scheme
apply Go back 1000 to all version in release
Merge pull request #4 from lctseng/hw2

Hw2