Document an EOL and release dates

There are various discussions about the fact that Juno is EOL in
November, but there is no hard documented date when such a thing is
expected to happen. Document when Juno was released and when it will EOL
- as well as the same for kilo, liberty and mitaka.

Change-Id: Iada72d966e93b8ff1f0febb4473a92fdd0532e51

doc/source/index.rst

@@ -13,11 +13,11 @@ Release Series
    - * :doc:`releases/mitaka`
      * `Under Development <https://wiki.openstack.org/wiki/Mitaka_Release_Schedule>`__
    - * :doc:`releases/liberty`
-     * Current stable release, security-supported
+     * Current stable release, security-supported (EOL: 2016-11-17)
    - * :doc:`releases/kilo`
-     * Security-supported
+     * Security-supported (EOL: 2016-05-02)
    - * :doc:`releases/juno`
-     * Security-supported
+     * Security-supported (EOL: 2015-12-03)
    - * :doc:`releases/icehouse`
      * EOL
    - * :doc:`releases/havana`

doc/source/releases/juno.rst

@@ -2,5 +2,7 @@
  Juno
 ======
 
+Originally Released: 2014-10-16
+
 .. deliverable::
    :series: juno

doc/source/releases/kilo.rst

@@ -2,5 +2,7 @@
  Kilo
 ======
 
+Originally Released: 2015-04-30
+
 .. deliverable::
    :series: kilo

doc/source/releases/liberty.rst

@@ -2,5 +2,7 @@
  Liberty
 =========
 
+Originally Released: 2015-10-15
+
 .. deliverable::
    :series: liberty

doc/source/releases/mitaka.rst

@@ -2,5 +2,7 @@
  Mitaka
 ========
 
+Projected Release Date: 2016-04-07
+
 .. deliverable::
    :series: mitaka