###Example usage
Scan a single subdomain record:
./xcname.py -g GANDI_API_KEY -d subdomain.example.com
Scan a list of subdomains for expired CNAME records:
./xcname.py -g GANDI_API_KEY -l domain_list.txt
Perform a zone transfer and if successful parse the results for expired CNAME records:
./xcname.py -g GANDI_API_KEY -z global-transfers-allowed.com
Perform zone tranfsers against a list of domains and parse the results for expired CNAME records:
./xcname.py -g GANDI_API_KEY -l domain_list.txt -z
Print nameservers for a specific domain
./xcname.py -g GANDI_API_KEY -d example.com -ns