Challenge 1: Implement renderUsers in application.coffee and replace the static HTML with a Handlebars template
Challenge 2: Create a Handlebars helper to render email links more succinctly
Challenge 3: Make sure the email helper you wrote can accept CSS class names as a parameter!
Challenge 4: Render your Handlebars template immediately on DOM-ready and implement a zero state for the empty set of users You must then re-render the template when the JSON data [finally] returns from the server.
Challenge 5: Find another way to implement the logic in the "Presenting?" column? For example, if you used a helper, you must now implement this logic without a Handlebars helper.