Added DNS Cache Scraper Module

This module makes non-recursive queries against a nameserver to scrape cached records.  Also I have attached 2 useful wordlists that could help pentesters and sys admins.

The first wordlist is av-update-urls.txt which can be used to scrape a nameserver and determine which AV product a client may be running.

The second wordlist is malicious-urls.txt which is a list of malicious urls that can be queried against a nameserver.  If any malicious urls are found it might be an indication that hosts on the network have been compromised.