add 0.0.0 into the changelog, and add dates

CHANGES.rst

-Changes in synapse 0.0.1
-=======================
+Changes in synapse 0.0.1 (2014-08-22)
+=====================================
+
 Homeserver:
  * Completely change the database schema to support generic event types.
  * Improve presence reliability.
@@ -18,3 +19,8 @@ Webclient:
  * Use the new initial sync API to reduce number of round trips to the homeserver.
  * Change url scheme to use room aliases instead of room ids where known.
  * Increase longpoll timeout.
+
+Changes in synapse 0.0.0 (2014-08-13)
+=====================================
+
+ * Initial alpha release