Add background image for general forum.
Make delete/edit buttons only show if current user owns topic.
Change font size of topic descriptions.
Add dependent destroy relationship between forum and topics.
Add comments table/model and associations.
Add Topic#comments_by_parent.
Fix display of more link.
Fix bug in Topic#comments_by_parent.
Add comments display to topic show page with nesting and styling.
Make database store plain text and convert markdown to HTML in views.
Make topic editing work with AJAX.
Remove form submitting div and gif where it was unnecessary.
Add post comment link, slide down of comment text box, and styling.
Add comment submission with AJAX.
Add markdown to HTML converting for comments.
Add reply/edit/delete buttons below comments and delete functionality.
Add comment editing functionality with AJAX.
Fix markdown to HTML conversion when editing comment.