For Zerigo accounts with more than 100 domains, the previous zones.all
method was unable to get to records beyond 100. This adds pagination per
the Zerigo API doc with :per_page and :page parameters. You can then use
count_zones to get the total zone count, divide by your :per_page, and
iterate over all pages to fetch all your zones.
https://www.zerigo.com/docs/apis/dns/1.1/zones/index
have added each of the Route 53 functions
list_hosted_zones is working. rest still need to be tested
[aws|linode|slicehost|zerigo|dns] added complete test cases for linode & slicehost DNS. Also added initial support for AWS Route 53