Check originalEvent.repeat *and* event.repeat

phantomjs < 2.0 doesn't support creating `KeyboardEvent` so the tests
were failing on CI

app/assets/javascripts/behaviors/quick_submit.js.coffee

@@ -14,7 +14,7 @@
 #   </form>
 #
 $(document).on 'keydown.quick_submit', '.js-quick-submit', (e) ->
-  return if e.originalEvent.repeat
+  return if (e.originalEvent && e.originalEvent.repeat) || e.repeat
   return unless e.keyCode == 13 # Enter
 
   if navigator.userAgent.match(/Macintosh/)

spec/javascripts/behaviors/quick_submit_spec.js.coffee

@@ -67,7 +67,4 @@ describe 'Quick Submit behavior', ->
     else
       defaults = { keyCode: 13, ctrlKey: true }
 
-    args = $.extend({}, defaults, options)
-    originalEvent = new KeyboardEvent('keydown', args)
-
-    $.Event('keydown', $.extend({}, args, {originalEvent: originalEvent}))
+    $.Event('keydown', $.extend({}, defaults, options))