Fix using invalid method IO.puts
Store the time of posts in ISO8601 format
Works with the new format of post times
Move the style specification for labels to the CSS file
Change the pane title for entire thread
Change the color for the response number
Put a margin at the top of posts
Remove .comment-entry-placeholders
Comment entries are now not resizable
Put 1em-space at the right of posts
Slightly darken the background of the page
Remove an outline box around a focused element
Change the appearance of comment entries
Change the appearance of entries of screen name and student ID
Put space between entries
Remove unnecessary attributes of screen name and student ID entries
Shorten too long screen names when rendering a post
Change the appearance of posts
Put horizontal lines between posts
Posts show only hours and minutes, and tooltips show full dates