Broken after recent Github UI changes.
Use the official button here: https://github.com/gratipay/Gratipay-Everywhere
Gittip Button for Github. Added via Chrome and Firefox extensions:
- https://chrome.google.com/webstore/detail/gittip/lgmkdccobiepammpajfoomochedhoiah/
- https://addons.mozilla.org/en-US/firefox/addon/gittip/
