Initial support for 16-bit ASN queries.

The ranges listed in asn.json are taken from as_del_list from
edge debian whois here:

https://github.com/rfc1036/whois

But a more updated list of allocations can be found here:

http://www.iana.org/assignments/as-numbers/as-numbers.xhtml
Add specs for asn16.
Add support for 32-bit ASN queries.

Data from asn32.json taken from this table:
http://www.iana.org/assignments/as-numbers/as-numbers.xhtml#as-numbers-2
Add specs for asn32.
Merge pull request #243 from linrock/asn-queries

Add support for ASN queries
CHANGELOG for GH-243