* Update CHANGELOG with release notes URL.
* Update README with new release number & name.
* Update metadata.json with new tag & dependencies.
* Add release note prelude for Mitaka.
* Update Reno release note to drop prelude.
* Improve release note landing page.
This patch splits out release notes into a separate dedicated file for
consistency with the puppetlabs puppet modules. Additionally, this
patch improves the release notes by:
- Fixing the tense to be consistent with commit message standards ("Add
new feature" instead of "Added new feature" or "Adds new feature")
- Breaking up changes into categories to make it easier for operators
to know what happened in the change: backwards-incompatible changes,
features, bugfixes, and maintenance commits
- Linewrapping to 80 chars
- Adding release dates, formatted according to ISO-8601