Merge pull request #300 from dmerchie/a11y

add Accessiblility on the close button

src/js/bootstrap-dialog.js

@@ -776,7 +776,7 @@
         createCloseButton: function () {
             var $container = $('<div></div>');
             $container.addClass(this.getNamespace('close-button'));
-            var $icon = $('<button class="close"></button>');
+            var $icon = $('<button class="close" aria-label="close"></button>');
             $icon.append(this.options.closeIcon);
             $container.append($icon);
             $container.on('click', {dialog: this}, function (event) {