Although the consistency proof is neither necessary nor sufficient
to prove misbehavior by a log, this will help with debugging if a
log returns a bogus consistency proof erroneously (which seems to
be happening with the Rocketeer log lately...).
All certificates are now parsed with a special, extremely
lax parser that extracts only the DNS names. Only if the
DNS names match the domains we're interested in will we attempt
to parse the cert with the real X509 parser. This ensures that
we won't miss a very badly encoded certificate that has been
issued for a monitored domain.
As of the time of commit, the lax parser is able to process every
logged certificate in the known logs.
