Correctly quote repo= when adding items

Because repository can be a string that includes spaces it needs to be
quoted to prevent ansible failing.
Add support for adding apt signing keys

This is basically a copy of apt_repositories but adjusted to handle
keys instead. It sits before repositories since it can't refresh on
its own but the keys need to be loaded before apt runs next.
Merge branch 'support-for-adding-new-keys-to-apt' of https://github.com/goetzk/ansible-apt into develop
added keys
Merge branch 'release/1.2.0'