* docs: elaborate the docs, add a faq section

* docs: fix a messed up command

* docs: update docs to reference v0.1 release

* docs(faq): fix stray whitespace

* docs: restructure docs for a leaner README

* docs: move first run section back to main readme

* docs: fix references to packages

* docs: fix reference to gke tutorial

* docs: fix missing source flag in examples

* docs: fix missing provider flag in examples

* docs: mention ingress support in main readme

* fix(dnsprovider): do not always initialize each DNS provider

* fix(dnsprovider): fix unnecessary error return value

* ref(dnsprovider): drop the store and use a simple switch for lookup

* docs(tutorials): add tutorial on how to use external-dns with GKE

* docs(gke): document how to setup a zone with its parent

* fix(ingress): append trailing dot to hostnames

* fix(source): update tests for sanitized DNS names

* feat(source): promote MockSource to source package

* feat(source): add MultiSource to merge other Sources

* feat(source): make structs and members of multiSource private

* ref(source): use constructor methods to create sources

* fix: import and use missing package

* fix(source): fix merge conflict with master branch

* storage proposal v1

* few fixes, remove code

* link issues

* another caveat

* fix typos, more details

* small refactoring

Add tests for Google DNS provider