make uuuidCache a local variable. Patch by Jan Kassens. Closes COUCHDB-560.

git-svn-id: https://svn.apache.org/repos/asf/couchdb/trunk@905483 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/jquery.couch.js b/jquery.couch.js
index 39bef76..4168a4b 100644
--- a/jquery.couch.js
+++ b/jquery.couch.js
@@ -41,7 +41,7 @@
     return user_doc;
   };
 
-  uuidCache = [];
+  var uuidCache = [];
 
   $.extend($.couch, {
     urlPrefix: '',