exports.js: helper functions for configs

Rather than the inline eval of bind (and, an hour or three ago, alert() and print()), ship exports.js as an app resource that is loaded into jscocoa's global context, allowing functions to be exposed for end users.

bind() actually disappeared for a bit there, it seems; I know I *could* just use api.bind directly, but nah.

And then use that to provide access to file contents, the coffeescript compiler, and thus require().