require d3 into image_viewer bundle

Author: etpinard

devtools/image_viewer/index.html

@@ -6,7 +6,6 @@
     <div id="plot-images"></div>
     <div id="plot-mock"></div>
 
-    <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js"></script>
-    <script type="text/javascript" src="test-images-viewer-bundle.js"></script>
+    <script type="text/javascript" src="../../build/image_viewer-bundle.js"></script>
 </body>
 </html>

devtools/image_viewer/viewer.js

@@ -1,8 +1,5 @@
-'use strict';
-
-/* global d3:false */
-
 var fs = require('fs');
+var d3 = require('d3');
 
 var $plotlist = document.getElementById('plot-list'),
     $images = document.getElementById('plot-images'),