service: add option to generate a DNS zone name to IPAddress.ptr_name()
service: refactor rdns editing to work on IPRanges larger than /24
various: remove debug statements
service: add API endpoint to redirect to any service based on ip address
service: add missing flask imports
Update README.md

sendmail and SSLify are flask exts we dep on
invoice: add invoice payment button to VPS list; remove old unused structure file from vps module