Make sure writer is closed so we don't leak file handles

git-svn-id: http://google-refine.googlecode.com/svn/trunk@2319 7d457c2a-affb-35e4-300a-418c747d4874

extensions/gdata/src/com/google/refine/extension/gdata/GDataExtension.java

@@ -145,6 +145,7 @@ abstract public class GDataExtension {
             new OutputStreamWriter(request.getRequestStream());
         writer.append("sql=" + URLEncoder.encode(query, "UTF-8"));
         writer.flush();
+        writer.close();
         
         return request;
     }