first POC of ES6 module

src/public/javascripts/bootstrap.js

@@ -0,0 +1,14 @@
+import searchTree from './search_tree.js';
+
+const $toggleSearchButton = $("#toggle-search-button");
+
+$toggleSearchButton.click(searchTree.toggleSearch);
+bindShortcut('ctrl+s', searchTree.toggleSearch);
+
+function bindShortcut(keyboardShortcut, handler) {
+    $(document).bind('keydown', keyboardShortcut, e => {
+        handler();
+
+        e.preventDefault();
+    });
+}