The initialization code for Pagedown input fields lets the view customize the title and any classes that are applied to the preview popup.
Apply custom titles and styles to the preview popups for bounty description on the new bounty and edit bounty forms.
Add a comment list partial for the common case of showing a list of comments.
Update the new comment form to use the new hooks for custom title and styles on the preview popup.
Break the new comment form out of the bounty show view and into its own partial, where it belongs.
Now that we have a test-friendly Markdown input editor, reactivate the test for the new comment form.