I18N changes prevent karma testing

[jsachs]

Any time I attempt to run Karma, I get the error thrown from greyscale-i18n.js, which is Expected global I18N object!. Because of how the I18N info is injected at the top of the file, this will not work with karma tests. Can you please either reconfigure the source file to allow client testing, or create the scaffolding for client tests in a way that does not throw errors?

Feel free to refer to my js-client-test-framework branch for reference.