Renamed "tire" to "retire" in community clients

Closes #5673

docs/community/clients.asciidoc

@@ -36,8 +36,8 @@ See the {client}/python-api/current/index.html[official Elasticsearch Python cli
 
 See the {client}/ruby-api/current/index.html[official Elasticsearch Ruby client].
 
-* http://github.com/karmi/tire[Tire]:
-  Ruby API & DSL, with ActiveRecord/ActiveModel integration.
+* http://github.com/karmi/retire[Retire]:
+  Ruby API & DSL, with ActiveRecord/ActiveModel integration (retired since Sep 2013).
 
 * https://github.com/PoseBiz/stretcher[stretcher]:
   Ruby client.