Create notifications for participants on new Submission

This is one of those terrifying moments when everything works just fine
in isolation but I have not tested the entire system yet.
new_attempt link method to Notify
add clojure/gigaseconds
Addressing issue #346.

This should result in the following order of pending submissions on the
dashboard:

- those that have never received a nit (oldest first)

- those in which some previous iteration received a nit, but this one
  has not (oldest first)

- those in which there is at least one nit on the current iteration
  (newest first)
Fix typo in about/nitpick

Signed-off-by: chatgris <jboyer@af83.com>
Add link to GitHub flavoured markdown. Fixes #176.
Temporarily move RNA transcription (Ruby)

Right now it is no longer a simple assignment suitable for exercise 2.
Point rouge to origin/master
Fix smoke tests
Fix crashing site