Show flash messages with styles.
Hide restricted posts.
Check the team registration period.
Fix json rendering.
Modify the condition for Challenge#opened?

It is opened when the time is exactly same as the open date.
Check whether the contest is running on submitting flags.
Revise home#index.
Show # captured flags in Challenges page.
Show answer status in teams index.
Add link for teams view in main menu.
Show team's answer status in challenge instead of player's.
Just list players in teams page.
Fix spec.
Links to player/team info in nav-bar.
Remove unused view.
Doesn't show flag submission form if the contest is closed.