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Merge branch '0.1.0' of https://github.com/silvinci/dhcp

Conflicts:
	lib/server.js
imporve serialsiation of sended message. options and cookirs need to be done
Merge branch '0.1.0' of https://github.com/silvinci/dhcp

Conflicts:
	lib/server.js
a full working example a a DNS based DHCP
An external configuration for the server has been added