#19 Add new function to full reverse lookup

[Alrond]

Similar to DNS.revlookup, but returns the list of all names. By error or no names returns empty list.
Example:
>>>print DNS.revlookupfull('199.166.24.1')
['vrx.net', 'www.vrx.net', 'ns1.vrx.net', 'vrx.net.24.166.199.in-addr.arpa', 'ns1.vrx.net.24.166.199.in-addr.arpa']

[Alrond]

fullresolver.patch

[Scott Kitterman]

A version of this is incorporated in py3dns 3.0.0.

[Stuart D. Gathman]

Adding to pydns-2.3.5 as revlookupall().

[Stuart D. Gathman]

Unfortunately, I can't close patches as I am not the admin. Committed to CVS