update elements and fix some bugs

lib/src/google-analytics/google-analytics-query.html

 <link rel="import" href="../polymer/polymer.html">
 <link rel="import" href="google-analytics-loader.html">
 
 <!--
 Element for querying the Google Analytics Core Reporting API.
 
 ##### Example
 
     <google-analytics-query
       ids="ga:1174"
       metrics="ga:sessions"
       dimensions="ga:country"
       sort="-ga:sessions"
       max-results="5">
     </google-analytics-query>
 
 @element google-analytics-query
-@extends google-analytics-base
+@demo
 @homepage https://googlewebcomponents.github.io/google-analytics
 -->
 
 <dom-module id="google-analytics-query">
 
   <template>
     <google-analytics-loader all-ready="{{setupReady}}"></google-analytics-loader>
   </template>
 
 </dom-module>
@@ skipping 350 matching lines @@
 
       get _hasRequiredParams() {
         return !!(this.ids && this.metrics && this.startDate && this.endDate);
       },
 
     });
 
   }());
 
 </script>