stop using arrows in comment buttons
dont change comment button size on hover
mv comment_form from forms to comment
fix nested comment_form
fix spacing
nest comment_actions
fix comment buttons color
fix comment button vertical align
fixup nest comment_actions

without this, comments inside the paper overlay as well as
paper_actions in the paper list below proposals are broken
fixup 80e7178 fix spacing
Merge pull request #503 from xi/feature-refactor-comment-css

refactor comment css