remove quiz demo metadata

metadata.html

@@ -7,7 +7,7 @@
       - hero and cross-fade-all should be always enabled.
   -->
   <template>
-    <core-animated-pages style="width:420px;height:630px;overflow:hidden;border:5px solid #ccc;background-color:#eee;">
+    <core-animated-pages style="width:420px;height:630px;overflow:hidden;background-color:#eee;">
       <section layout horizontal center center-justified>
       </section>
       <section>
@@ -26,58 +26,4 @@
     <link rel="import" href="transitions/tile-cascade.html">
   </template>
 
-</x-meta>
-
-<x-meta id="quiz-demo-front-page" label="Quiz Demo Front Page" group="Demo">
-<template>
-
-  <section layout vertical style="box-sizing:border-box;width:420px;height:630px;">
-
-    <section class="top" hero style="background-color:#ffff8d;" flex layout horizontal center center-justified>
-    </section>
-    <div class="bottom" hero style="box-sizing:border-box;position:relative;height:80px;background-color:#ffeb3b;padding:24px;color:#fff;font-size:32px;">
-      <span>General Knowledge</span>
-    </div>
-    <div hero class="dummy"></div>
-    <div class="fab fab-0" style="position:absolute;fill:#fff;bottom:50px;right:24px;">
-      <paper-fab icon="av:play-arrow" style="background-color:#ff4081;"></paper-fab>
-    </div>
-  </section>
-
-</template>
-
-<template id="imports">
-  <link rel="import" href="../core-icons/core-icons.html">
-  <link rel="import" href="../core-icons/iconsets/av-icons.html">
-  <link rel="import" href="../paper-fab/paper-fab.html">
-</template>
-</x-meta>
-
-<x-meta id="quiz-demo-question" label="Quiz Demo Question" group="Demo">
-<template>
-
-  <section layout vertical style="box-sizing:border-box;width:420px;height:630px;">
-
-    <div hero style="box-sizing:border-box;position:relative;height:240px;background-color:#ffeb3b;padding:24px;color:#fff;font-size:32px;">
-      <span>Question</span>
-    </div>
-    <section hero flex style="background-color:#eee;padding:24px;font-size:16px;">
-      <span>Answer here</span>
-    </section>
-  </section>
-
-</template>
-</x-meta>
-
-<x-meta id="quiz-demo-score" label="Quiz Demo Score" group="Demo">
-<template>
-
-  <section layout vertical style="box-sizing:border-box;width:420px;height:630px;background-color:#ffff8d;" center center-justified>
-
-    <div hero style="box-sizing:border-box;position:relative;height:150px;width:150px;background-color:#ffeb3b;color:#fff;font-size:100px;" layout vertical center center-justified>
-      <span>+8</span>
-    </div>
-  </section>
-
-</template>
 </x-meta>