* service source: support for multiple hostnames per annotation

* go fmt

* Make parseHostnameAnnontations inline

* Update CHANGELOG.md

* Update Changelog

* ref(sources): refactor source registration and lookup to be lazy.

* fix(fake): don't make changes to passed in config values

* rework without init, tests are missing

* make client provider public

* fix all tests

* change parameter list order, minor improvements

* clientprovider -> clientgenerator, switch naming for interface/struct

* Support for multiple domains within --domain-filter

The parameter accepts a comma separated list of domains with or without trailing dot. Example: --domain-filter="example.org, company.test.,staging.com". Closes #247 and #229

* Add boilerplate header

* Add documentation for methods and structs

* use StringsVar for the domain-filter flag

* go fmt

* Remove camel case from tests

* Revert changes in README.md

* Move DomainFilter to provider package

* Make a new slice and copy elements to it

* Update CHANGELOG.md

* docs: change minor spelling mistake

Originally had `dry-run=true` as the dry run flag but that doesn't work and makes external-dns fail to start. Changed to `--dry-run`.

* CloudFlare Provider

* updating glide

* gofmt cloudflare_test.go

* Unset envs to test NewCloudFlareProvider

* More tests

* fix(cloudflare): fix compiler errors resulting from merge

* Typo

* Undo vendor changes

* decrease api calls, fix some nits

* Cloudflare iteration (#2)

* reduce the number of API calls

* match by type and name for record id

* improve coverage and fix the bug with suitable zone

* tests failed due to wrong formatting

* add cloudflare integration to the main

* vendor cloudflare deps

* fix cloudflare zone detection + tests

* fix conflicting test function names

* docs(contributing): explain the concept behind sources and providers

* docs(contributing): we don't filter Services by type

* Initial Digital Ocean as a new provider

* chore: vendor dependencies

* Remove zone parameter from ApplyChanges and Records

* fix(digitalocean): fix correct imports, unshadow a variable

* fix(digitalocean): respect domain-filter if provided

* add changes to digital ocean provider from PR review (#3)

* fix tests and bugs in find suitable zones for digital ocean (#5)

* tests failed due to wrong formatting

* add digitalocean integration to the main and more tests

* fix suitable zone for digital ocean

* fix: Load all known Kubernetes Auth Plugins

* chore: vendor CoreOS' oidc library

* vendor Azure Go SDK (#210)

* vendor the Azure Go SDK and dependencies

* add initial Azure DNS provider implementation (#210)

* add 'azure' value to 'provider' command line option
* add 'azure-config-file' command line option
* add 'azure-resource-group' command line option
* implement initial Azure DNS provider

note: azure provider is not yet fully implemented (does not query for existing
records).

tests and documentation are forthcoming.

* add a tutorial for the Azure provider (#210)

* add tutorial for using ExternalDNS with Azure DNS

* finish implementation of Azure DNS provider (#210)

* implement the Records method for the Azure DNS provider

* refactor Azure API interface for future tests (#210)

* make Azure provider use an interface for future unit tests

* add unit tests for the Azure provider (#210)

* test retrieving Azure DNS records.
* test updating and deleting Azure DNS records.
* test dry run for the Azure provider (i.e. noop).

* ref(source): use testify with mocks in test code

* fix: re-introduce NewMockSource for convenience

* fix: avoid circular dependency

* ref: increase usage of testify

* chore: vendor testify as a dependency

* fix(*): cleanup testify expectations

* Expose inmemory provider to cli

So we can test `--source fake` without needing to touch AWS/Google.

* Add FakeSource

`external-dns --provider inmemory --source fake --dry-run --once`

OR

`external-dns --provider aws --source fake --fqdn-template <hostname suffix> --dry-run --once`

NB: `--fqdn-template` because otherwise we'll default to creating, e.g.,
`abcd.example.com`, which `--provider aws` filters out because you
likely don't have a Zone for `example.com.`  Could also be resolved by
removing the need to use a real provider; the inmemory provider,
perhaps, though it's not entirely hooked up.

Closes kubernetes-incubator/external-dns#22

* Style feedback from Travis CI

* Improve optionality of kubernetes client

* ref(sources): refactor source registration and lookup to be lazy.

* Revert "ref: refactor source registration/lookup to be lazily initialized"

* chore: add instrumented HTTP client library

* feat: add client-side metrics to outgoing HTTP clients

Closes #206

Closes: #47

* chore: update and vendor all dependencies

* chore: don't forget custom import repo-infra

* reactor inmemoy provider

* add inmemoryclient to logically split functions

* implement apply changes

* fix all tests

* chore: use bogus value for zone to ensure it's ignored

* chore: use bogus value for zone to ensure it's ignored (2)

* adjust docs before the v0.3.0 release

* minor fixes

* docs: add missing dot

* docs: add missing dot

* docs: drop line

* docs: drop another line

* adjust documentation

* update main readme

* checkbox for releases, add --txt-owner-id flag in description

* docs: minor weird character fixes [ci skip]

* feat: add and use a deduplicating source

* chore: add log entry when endpoint was deduplicated

* feat(config): change defaults, switch flag processing to kingpin

* chore: vendor kingpin as a dependency

* feat(config): auto-detect cluster config from the environment

* chore: clean up definition of flags

* chore: sanitize flags even further

* chore: update changelog with latest flags changes

* fix(aws): fix messed up test name

* minor improvements to logging

* chore(*): change log.Infoln to log.Info

* fix: fix incorrect example code

Bug in question: https://github.com/kubernetes-incubator/external-dns/issues/154

This is fixed in 0.2.1