* Added: `npm run font` command for editing the Fontello icon font. Use it to get started, then start the development server with `npm start` and changes will automatically save when you click `Export Font` from Fontello.
* Changed: The list of Fontello icons is now extracted from our Fontello config file so that it doesn't have to be manually updated.
* Configure the project to allow the use of JSX in .jsx files.
* Add linting for JSX.
* Rewrite most existing code that uses `createElement` to use JSX syntax.
* Stop importing `createElement as e`. That's what the minifier is for. And we don't have to write it manually so much now because of JSX syntax.