Fix how IDs work with native jetpack addons

We've just launched [jpm](https://gitub.com/mozilla/jpm) into beta, with new rules for IDs, maintained in the [jetpack-id](https://github.com/jsantell/jetpack-id) module, and after testing with my fork, I think we're good to go to merge this in and start using your module in npm :smile: 

All tests passing again, but can't test the coverage/saucelabs stuff, let me know if this works for you to get merged in!