Log Message:
dnsruby-1.41:
o RFC3597 unknown classes (e.g. CLASS32) now handled correctly
  in RRSIGs
o Resolver#do_caching flag added for Resolver-level caching
o DNSKEY#key_tag now cached - only recalculated when key data
  changes
o Bugfix where Resolver would not time queries out if no 
  nameservers were configured
o Recursor now performs A and AAAA queries in parallel
o Fix for zero length salt
o Fixing priming for signed root
o Fixes for DLV verification
o Other minor fixes