Resolve #40

[Ced2142]

This returns the whole mac address object. The following attributes are returned now:

 "macaddress": {
   "addr": "AA:AA:AA:AA:AA:AA",
   "addrtype": "mac",
   "vendor": "Some Vendor"
  }

The addrtype attribute is useless but the vendor attribute it pretty useful in my opinion. If only the mac address is wanted, the PR can be changed to only return the addr value with .get('addr') in the return statement of parse_mac_address.