Dialog and Alert roles can host keyboard listeners

Author: jessebeach

src/index.js

@@ -103,7 +103,9 @@ module.exports = {
               'onKeyDown',
               'onKeyUp',
             ],
+            alert: ['onKeyUp', 'onKeyDown', 'onKeyPress'],
             body: ['onError', 'onLoad'],
+            dialog: ['onKeyUp', 'onKeyDown', 'onKeyPress'],
             iframe: ['onError', 'onLoad'],
             img: ['onError', 'onLoad'],
           },