Add options for Zerigo List Hosts

Add options to List Hosts for fqdn, page, per_page. 

There is a little overlap find_hosts, but this adds pagination as well.

I always have a little problem with the Shindo tests, so let me know if those need updating. 
If you get a chance, do you mind running your changes through rubocop?  We have a style file in the root of the project.  I suspect this is going to raise an issue for using the mutable variant of `select`.  It may also for not having spaces around the `{}`.