Add revision history sections

Add a table at the end of each policy where we can highlight major
revisions. This is different than the more detailed history section
above, which is combined with the alternatives, because it is just meant
to give a summary.

Change-Id: Id24b077cfbb3d2ee6ae66eb33033347760056399

specs/policy-template.rst

@@ -108,7 +108,16 @@ are:
 
 * Anything else you feel it is worthwhile to refer to
 
+Revision History
+================
 
+.. list-table:: Revisions
+   :header-rows: 1
+
+   * - Release Name
+     - Description
+   * - 
+     - Introduced
 
 .. note::
 

specs/policy/incubator.rst

@@ -289,12 +289,36 @@ References
   marking it obsolete:
   http://lists.openstack.org/pipermail/openstack-dev/2014-August/044360.html
 
+* `Taking the Long View
+  <http://www.slideshare.net/doughellmann/taking-the-long-view-how-the-oslo-program-reduces-technical-debt>`_,
+  Kilo summit presentation by Doug Hellmann and Mark McLoughlin with
+  some history of the incubator.
+
 .. _Oslo/CreatingANewLibrary: https://wiki.openstack.org/wiki/Oslo/CreatingANewLibrary
 
 .. _oslo-incubator project: https://launchpad.net/oslo-incubator
 
 .. _Oslo/GraduationStatus: https://wiki.openstack.org/wiki/Oslo/GraduationStatus
 
+Revision History
+================
+
+.. list-table:: Revisions
+   :header-rows: 1
+
+   * - Release Name
+     - Description
+   * - Essex
+     - Incubator created as ``openstack-common`` repository
+   * - Folsom
+     - "Managed copy and paste" concepts developed
+   * - Juno
+     - Decide to delete graduating modules from the incubator after
+       one full cycle.
+   * - Kilo
+     - Change policy to delete graduating modules immediately after
+       the library is released.
+
 .. note::
 
   This work is licensed under a Creative Commons Attribution 3.0

specs/policy/liaisons.rst

@@ -88,6 +88,17 @@ References
   list of volunteers moved to
   https://wiki.openstack.org/wiki/CrossProjectLiaisons
 
+Revision History
+================
+
+.. list-table:: Revisions
+   :header-rows: 1
+
+   * - Release Name
+     - Description
+   * - Juno
+     - Introduced
+
 .. note::
 
   This work is licensed under a Creative Commons Attribution 3.0

specs/policy/naming-libraries.rst

@@ -121,6 +121,17 @@ References
 
 .. _Project Creator's Guide: http://docs.openstack.org/infra/manual/creators.html#choosing-a-good-name-for-your-project
 
+Revision History
+================
+
+.. list-table:: Revisions
+   :header-rows: 1
+
+   * - Release Name
+     - Description
+   * - Icehouse
+     - Introduced
+
 
 .. note::
 

specs/policy/private-symbols.rst

@@ -125,6 +125,19 @@ References
 .. _documentation for the public APIs of all Oslo libraries: http://docs.openstack.org/developer/openstack-projects
 
 
+Revision History
+================
+
+.. list-table:: Revisions
+   :header-rows: 1
+
+   * - Release Name
+     - Description
+   * - Icehouse
+     - Introduced
+   * - Kilo
+     - Formalized during the move out of the ``oslo`` namespace package.
+
 
 .. note::
 

specs/policy/spec-approval.rst

@@ -72,6 +72,17 @@ References
 
 N/A
 
+Revision History
+================
+
+.. list-table:: Revisions
+   :header-rows: 1
+
+   * - Release Name
+     - Description
+   * - Juno
+     - Introduced
+
 
 .. note::
 

specs/policy/versioning.rst

@@ -248,6 +248,17 @@ References
 * http://lists.openstack.org/pipermail/openstack-dev/2014-June/037159.html
 * `pbr's modified SemVer`_
 
+Revision History
+================
+
+.. list-table:: Revisions
+   :header-rows: 1
+
+   * - Release Name
+     - Description
+   * - Juno
+     - Introduced
+
 
 .. note::