* feat(google): add ability to apply changes generated from a plan
* feat(controller): first implementation of controller
* feat: allow to configure in-cluster and kubeconfig
* fix(controller): call RunOnce at the right time and in a loop
* feat(google): add dryRun attribute to Google DNS provider
* fix: use hosted zone id instead of DNS name
* fix(google): stupidly filter by A records for now
* feat: allow specifying the google project and zone
* feat: provide a dry-run flag which defaults to false
* chore: vendor new dependencies
* fix(config): fix failing tests for config object
* ref(controller): return plain value of ApplyChanges
* ref: simplify how to get a valid kubernetes client
