All modern browsers come with window.atob() and window.btoa() for base64 serialization and deserialization; the base64 lib should really only be required as shim
The library defaults to btoa (and Buffer if running in NodeJS) so including Base64.js should only be necessary if you need to support older browsers.
ah. probably worth making that a little more explicit in the readme.
clarify optional Base64 and the regrettable jQuery
Refs #18, #19