Modify Host.receive(), add Host.checkARPReply() in sts/sts/entities.py and create sts/tests/unit/sts/host_arp_reply_test.py for unit test
Fix the bugs of _check_arp_reply in sts/sts/entities.py and add two test cases in sts/tests/unit/sts/host_arp_reply_test.py
fix the return type of Host.read()
Cleaner version
Cleaner _if_valid_arp_request()
Merge pull request #9 from ZhiLiu/master

Modify Host.receive(), add Host.checkARPReply() in sts/sts/entities.py a...