* helpers.js: Refactor addRecord to recordBuilder
* Fixed failing dns test
* helpers.js: Fixed a typo in SRV handling
* helpers.js: Move type to top level argument
* Removed support for numeric modifiers
* helpers.js: Added IMPORT_TRANSFORM ttl argument back
* Implement Digitalocean provider
* Vendor digitalocean lib
* Enable SRV for Digitalocean and fix the tests
* Test cname etc. records pointing to the same domain
* Added registrar support to Route53 provider
* ran gofmt on route53Provider
* Caveat: If you use r53 is a Registrar but not as a Dns Service Provider, DNSControl may be DNS-related API calls that you do not have IAM permissions to do.
* New flag: -delay=x where x is ms to delay between domains. This feature will probably be removed some day when a better rate-limiting solution can be engineered.
* Added CAA support
* Fixed bind parsing of CAA records
* Added CAA parsing test
* Renamed CAA json fields
* Added CAA tag validation
* Updated CAA docs to clarify on the value field
* parse_tests: Fixed typo in caaflags
* Added integration test
* Small cleanups
* Integration tests: PTR tests should only happen if CanUsePTR
* Integration tests: SRE tests should only happen if CanUseSRV
* CanUseSRV should be validated early (in pkg/normalize/validate.go)
* CLOUDFLARE does not support SRV. Check for this during validation
* GCLOUD CanUsesRV (mostly by accident, but whatever works)
* Add support for SRV records for NAMEDOTCOM and ROUTE53.
* Improve docs
* Rename RR() to ToRR().
* Rename RecordConfig Priority to MxPreference (affects json IR data)
