Share on facebook. Add Open Graph meta.

Signed-off-by: Emilien Kenler <hello@emilienkenler.com>
Merge branch 'master' into HEAD
Merge pull request #77 from MiLk/weekmail

Weekmail
Merge pull request #56 from MiLk/fb-sharer

Fb sharer
Merge branch 'weekmail' of https://github.com/MiLk/portail into weekmail
Retirer le lien retour

Il y a un bouton dans le navigateur et c'est plus simple pour copier/coller