Add 2.99.0 release

Signed-off-by: Jan Friesse <jfriesse@redhat.com>

index.html

@@ -67,6 +67,10 @@
             <small>Download latest stable</small>
             flatiron release <small>1.4.9</small>
           </a>
+          <a href="http://build.clusterlabs.org/corosync/releases/corosync-2.99.0.tar.gz" class="button">
+            <small>Download latest developement</small>
+            camelback release <small>Corosync 3.0 - Alpha1</small>
+          </a>
 
           <p class="repo-owner"><a href="https://github.com/corosync/corosync"></a> is maintained by <a href="https://github.com/corosync">corosync</a>.</p>