Windows vs Bash Templating

Specifically within `package.json`, the `push` script templates `npm_config_bucket` and `npm_config_bucket_url` with `%` template characters. This functions fine on a windows box, but needs to be switched to a single leading `$` to build correctly on a Linux box. I imagine this sort of problem has been solved by other `npm` users, but I'm at least opening this issue for tracking.