Add color coding for long waits and add icon for likely duplicate items. Adjust title styling.

Test Plan:
. Fire up a web page and see what happens. :)
. If desired, can manually add the "slow" and "very-slow" classes to "entry"

Reviewers: ben

Reviewed By: ben

CC: alpert

Differential Revision: http://phabricator.khanacademy.org/D6405