During the installation process the script was giving the opportunity to choose one language for each .php file in the lang directory, but since we put an index.php file in the dir index.php was an available language now there is a check for that
fixed the bug where a user's points would go up by solving the same challenge multiple times

Signed-off-by: Spyros Gasteratos <morfeas3000@gmail.com>
Refactored the Rankings system now it works

Signed-off-by: Spyros Gasteratos <morfeas3000@gmail.com>
Fixed #87 by adding a check for Null values in ChallengeMonitorController::check_values and loading the values from session if they are null

Signed-off-by: Spyros Gasteratos <morfeas3000@gmail.com>
Merge conflict from next-dev fixed