Major update

[cytopia]

Major update

Complete rewrite which changes the env variables used to create A, CNAMES and PTR records.

• PTR records are grouped by /24 and for each /24 net an own zone is created with records from the same zone appended.
• All other records are stored in a response policy zone to simply overwrite records without affecting the whole zone.

Checklist

• [X] Integration tests updated
• [x] README updated

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• Closes https://github.com/cytopia/docker-bind/pull/21
• Fixes https://github.com/cytopia/docker-bind/issues/20
• Fixes https://github.com/cytopia/docker-bind/issues/17
• Fixes https://github.com/cytopia/docker-bind/issues/16
• Fixes https://github.com/cytopia/docker-bind/issues/19