Merge pull request #549 from hypothesis/remove-window-annotator-export

Stop exporting the main annotation layer object as `window.annotator`

src/annotator/main.js

@@ -61,10 +61,9 @@ $.noConflict(true)(function() {
 
   config.pluginClasses = pluginClasses;
 
-  window.annotator = new Klass(document.body, config);
+  var annotator = new Klass(document.body, config);
   appLinkEl.addEventListener('destroy', function () {
     appLinkEl.parentElement.removeChild(appLinkEl);
-    window.annotator.destroy();
-    window.annotator = undefined;
+    annotator.destroy();
   });
 });