First step for the challenges implementation
Adding the ranking page and finalizing the challenge validation page.
Fixing the ranking page
Fixing the ranking (again)
Forgot to save the team object after modifying it
Fixing icons font tag
Fixing display problems for the administrator
Better highlight of the current team in ranking page
Avoid to leak the  number of challenges before the contest start
Fixing the bugs and feature requests from Morino
Fixing routing problem
Nicer way to disable the buttons when challenge is done
Fixing the list of categories
Admitting staff to see challenges before opening
Forgot to allow modal windows to be visible
Fixing a missing column in table