Remove unreachable error management code

Because it never fails because we always use it right

New test for update with bad form data

UI and UX on all pages

See merge request !9

# Conflicts:
#   routes/ads.js
#   views/ads/create.hbs

Images were overflowing out of parent, set their parent's width
to absolute value. REALLY WEIRD IM ANGRY AHHHH.

Testing (encore en cours mais on continuera sur master)

See merge request !8

refactor des tests pour ne plus utiliser la status
plus de status personnalisé sur redirections

Ajout gitignore la sortie des coverage stats
mort aux var

ajout d'un module de calcul de coverage