access to bureaucracy for attaching event listeners

[jywarren]

bureaucracy is constructed here: https://github.com/bevacqua/woofmark/blob/master/src/prompts/prompt.js#L111

To attach an event listener and handle successful file upload, I'm wondering if we can return or otherwise expose bureaucracy outside the prompt.js scope, for attaching crossvent handlers.

Apologies for the flurry of issues! Not super high priority.