Questions regarding external code

[stefan6419846]

According to the README, the project itself is subject to the MIT license. Reading
through the repository, there are two further references to external code:

1. There is

   jquery.base64.js/jquery.base64.js

   Line 5 in c762010

   * Based upon: https://gist.github.com/Yaffle/1284012

   The corresponding GitHub Gist does not carry any copyright notice. Is there any evidence that @Yaffle acknowledged the MIT license here?

2. In https://github.com/yckart/jquery.base64.js#thanks, there is a thank you notice for https://github.com/carlo/jquery-base64. To which extent is the referenced code part of jquery.base64.js? It is not really clear to me how both repositories do relate.