Changelog

• added reset <peer> <server-impl> command (resets anything that peer synced using server-impl, useful for testing resyncing)
• made compatible with ssb-db2
• replaced replicate.upto muxrpc with createLogStream for counting messages
  • good: works with ssb-db2, lets you count partial replication
  • bad: significantly slower when running against large databases (e.g. 100k feeds)

see #36 for how the speed issue introduced in this version will be remedied