change file encode for log dir
	modified:   log/logging.cc
	modified:   log/logging.h
	modified:   net/README.md
	modified:   net/acceptor.cc
	modified:   net/acceptor.h
	modified:   net/inet_address.h
	modified:   net/socket.cc
	modified:   net/socket.h
	modified:   net/tcp_server.h
improve net library