Server logic works much better

TODO:
* Detect end of file better
* Print system time in log
server now prints out time
Increased SWS to 9, per assignment.
Need to test acks
Merge branch 'gpoisoned'

Conflicts:
	src/GBNclient.c
Merge branch 'master' of https://github.com/Chingzilla/go-back-n into gpoisoned
Need to figure out receiving ack