add LocalIPs() to detect ip
add TODO
add safemap copied from beego
add rescan IP address support
fix nmap
convert mac to lowercase
If Exists Update Else Insert
find the cached IP address to refresh MACMapping if vm is active
remove this log
Merge pull request #8 from hopkings2008/merge_upstream

fix vms null
Update README.md
add planed task to rescan IP
Merge branch 'master' of https://github.com/thesues/catkeeper
add parsexml test
change MACMapping from map[string]string to []SubNet
display ip address