cleaner way of preventing double click events + clean up tests for jshint

docs/assets/js/bootstrap.js

@@ -242,9 +242,9 @@
 
   $(document).on('click.bs.button.data-api', '[data-toggle^=button]', function (e) {
     var $btn = $(e.target)
-    if ($btn.has('input').length) return // throw away double event for inputs
     if (!$btn.hasClass('btn')) $btn = $btn.closest('.btn')
     $btn.button('toggle')
+    e.preventDefault()
   })
 
 }(window.jQuery);