If you can somehow add Mozilla Persona without modifying main.js - client-side JavaScript file, I will consider metging this PR.

After PR #59 there will be an object in secrets.js that let's you disable or enable authentication methods of your choice. I want Persona sign in to be optional as well.

Sure, a couple of options.

1. I could either add a new js file public and have it be referenced as part of application.js
2. I could insert script elements into only login and profile jade templates.

Do you have a preference?

Please refer to Issue #63.