* adding route53_hostnames option to set the hostnames from route 53
* checking whether the route53_hostnames option is present as suggested by @s-hertel
* setting route53_hostnames to None when config option not present
* skip the to_safe only when using route53_hostnames option, as suggested by @ryansb
* skipping the to_safe strip only for the hostnames that came from route53 as suggested by @ryansb