Updated base64 to 0.2.0

Pulled from https://raw.github.com/davidchambers/Base64.js/master/base64.js and https://raw.github.com/davidchambers/Base64.js/master/base64.min.js. Version number matches [package.json](https://github.com/davidchambers/Base64.js/blob/master/package.json)