Split release notes into a CHANGELOG.md file

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

Change-Id: I93f6546ef9128bbf102595bd920f74a4959b7848

CHANGELOG.md

@@ -0,0 +1,19 @@
+##2015-06-17 - 5.1.0
+###Summary
+
+This is a feature and bugfix release in the Juno series.
+
+####Features
+- Adding augeas insertion check
+
+####Bugfixes
+- MySQL: change default MySQL collate to utf8_general_ci
+
+####Maintenance
+- Update .gitreview file for project rename
+- spec: pin rspec-puppet to 1.0.1
+
+##2014-11-25 - 5.0.0
+###Summary
+
+Initial release for Juno.

README.md

@@ -11,7 +11,6 @@ openstacklib
 5. [Limitations - OS compatibility, etc.](#limitations)
 6. [Development - Guide for contributing to the module](#development)
 7. [Contributors - Those with commits](#contributors)
-8. [Release Notes - Notes on the most recent updates to the module](#release-notes)
 
 Overview
 --------
@@ -325,17 +324,3 @@ Puppet Module :: OpenStack Version :: OpenStack Codename
 4.0.0         -> 2014.1.0          -> Icehouse
 5.0.0         -> 2014.2.0          -> Juno
 ```
-
-Release Notes
--------------
-
-**5.1.0**
-
-* Update .gitreview file for project rename
-* Adding augeas insertion check
-* MySQL: change default MySQL collate to utf8_general_ci
-* spec: pin rspec-puppet to 1.0.1
-
-**5.0.0**
-
-* This is the initial release of this module.