To do:

   - clean up "dangling" A/B/C class sockets during run
   - progress bar (with ETA)
   - resolve the last few unresolved IPs. I'm looking into a whois lookup or a "closest hop" approach
   - arrange benchmarks into a comprehensive table

Done: 

   - direct STDIN input (0.3)
   - add ability to edit databases create with "--database" (0.5.1)

