add indeterminate checkbox support

docs/assets/js/src/application.js

@@ -10,7 +10,6 @@
  */
 
 /* global ZeroClipboard */
-/* global SimpleJekyllSearch */
 
 !function ($) {
   'use strict';
@@ -102,6 +101,9 @@
       $(this).prev('.progress-striped').toggleClass('progress-animated')
     })
 
+    // Custom indeterminate checkbox
+    $('.bs-example-indeterminate input').prop('indeterminate', true)
+
     // Config ZeroClipboard
     ZeroClipboard.config({
       moviePath: '/assets/flash/ZeroClipboard.swf',