I noticed that the subdomain dev.libre-mesh.org runs with a self-signed
certificate, which is annoying because casual people browsing (and
security paranoid) won't accept to add an exception in order to read
more and will leave...
A free browser-accepted certificate can be obtained from StartSSL 
(for that specific domain, wildcards and extended verification certs are
not for free of course, but we there is no need for them).