Replace direct 'click' event binding with delegated binding. Fixes #58.

Direct binding only works for elements already in the DOM, delegated
binding works for all elements that match a filter even if created after
the DOM is fully loaded.

app/templates/admin_history.html

@@ -71,8 +71,7 @@
         "info" : true,
         "autoWidth" : false
     });
-
-    $(".history-info-button").click(function() {
+    $(document.body).on('click', '.history-info-button', function() {
         var modal = $("#modal_history_info");
         var info = $(this).val();
         modal.find('.modal-body p').text(info);