To use:

1.) Sign up for the Safari developer program online, at
        https://developer.apple.com/programs/safari/
2.) Generate a signed developer certificate.

3.) $ ./go //javascript/safari-driver:SafariDriver
4.) Launch Safari
5.) Develop > Show ExtensionBuilder
6.) Add Extension
7.) Select ./build/javascript/safari-driver/SafariDriver.safariextension
8.) Install

To reload any changes made:

1.) $ ./go //javascript/safari-driver:SafariDriver
2.) Develop > Show ExtensionBuilder
3.) Select WebDriver extension
4.) Reload