Introduced an array for possible ips which are calculated on the beginning.
Added macaddress to ip structur and ping is now returning the mac.

Maybe there's a bug left. Arduino is not working fine.
Merge branch 'master' of https://github.com/powtac/Autarc_LAN_User_Stats

Conflicts:
	autarc_lan_user_stats/ICMPPing.cpp
	autarc_lan_user_stats/autarc_lan_user_stats.ino