Updating CHANGES for release

git-svn-id: https://svn.apache.org/repos/asf/syncope/branches/1_2_X@1623411 13f79535-47bb-0310-9956-ffa450edef68
Updating downloads site page for release

git-svn-id: https://svn.apache.org/repos/asf/syncope/branches/1_2_X@1623412 13f79535-47bb-0310-9956-ffa450edef68