Initialized switch to a unified Submission object
Added "user" attribute to submissions
stdout / stderr only returned to editors
Added CPU time to the output
Added parsed errors to the submission
add username in sign page
remove jumbotrone in form of sign page
exercises list's presentation : version 1
add button sign up in header
Merge branch 'dev' of https://github.com/INSA-4IF-SpecIFic/elif into dev
Adds 'git-hook-install.sh' script to install pre-commit hook.
Merge branch 'dev' into sandbox