Aesthetic tweaks to sheriff-o-matic.

Tools/GardeningServer/ui/ct-bot-failure-card.html

 <!--
 Copyright 2014 The Chromium Authors. All rights reserved.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 -->
 
 <link rel="import" href="ct-builder-grid.html">
 <link rel="import" href="ct-commit-list.html">
 <link rel="import" href="ct-test-list.html">
 
 <polymer-element name="ct-bot-failure-card" attributes="group builderList" noscript>
   <template>
     <style>
       ct-builder-grid {
         margin-right: 10px;
         width: 250px;
       }
 
+      ct-commit-list {
+        margin-top: 15px;
+      }
+
       #failure {
         flex: 1;
       }
     </style>
     <ct-builder-grid builderList="{{ builderList }}"></ct-builder-grid>
     <div id="failure">
       <ct-test-list tests="{{ group.failures }}" tree="{{ tree }}"></ct-test-list>
       <ct-commit-list commitList="{{ group.commitList }}"></ct-commit-list>
     </div>
   </template>
 </polymer-element>