Merge pull request boknows#10 from alistair-marshall/fix-dygraphs

Use dygraphs hosted on cdnjs

index.html

@@ -91,7 +91,7 @@
             }
     </style>
     <script src='https://code.jquery.com/jquery-1.11.3.min.js' language='Javascript' type='text/javascript'></script>
-    <script type="text/javascript" src="http://dygraphs.com/dygraph-combined.js"></script>
+    <script src="//cdnjs.cloudflare.com/ajax/libs/dygraph/2.1.0/dygraph.min.js"></script>
     <script type="text/javascript" src="js/bootstrap.min.js"></script>
     <script type="text/javascript" src="js/bootstrap-select.min.js"></script>
     <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.7/angular.min.js"></script>