Filter other non-public addresses from ASN lookup

[nbrooke]

Right now we don't try to do ASN lookups on any of the common private addresses that could screw up the ASN lookup (192.168., 10., etc), but from a reading around it looks like there are some less well known blocks that are also reserved, we should make sure that we are dropping all reaserved private addresses.

More here

http://en.wikipedia.org/wiki/Private_network http://en.wikipedia.org/wiki/Link-local_address