版本：0.1.2-alpha
- https://cdn.bootcdn.net/ajax/libs/photon/0.1.2-alpha/css/photon.css
- https://cdn.bootcdn.net/ajax/libs/photon/0.1.2-alpha/css/photon.min.css
- https://cdn.bootcdn.net/ajax/libs/photon/0.1.2-alpha/fonts/photon-entypo.svg
UI toolkit for building desktop apps with Electron.