update contributors list

i'm not the maintainer anymore.
Merge pull request #246 from albertz/master

update contributors list
added parameter '--no-mdns' to disable multicast dns
added parameter '--hw-addr' to passed fixed hardware address
Merged Nachtzuster/sntp as of Apr 29, 2014
Merge remote-tracking branch 'origin/1.0-dev' into HEAD

Conflicts:
	README.md
	socketlib.c
	socketlib.h
Fix README.md
merge pr/7