started to add a histogram on key.

client/index.html

@@ -56,6 +56,8 @@
     <script src="bower_components/spin.js/spin.js"></script>
     <script src="bower_components/angular-spinner/angular-spinner.js"></script>
     <script type="text/javascript" src="bower_components/angular-ui-codemirror/ui-codemirror.js"></script>
+    <script type="text/javascript" src="bower_components/highcharts/highcharts.js"></script>
+    <script type="text/javascript" src="bower_components/highcharts-ng/dist/highcharts-ng.js"></script>