dependencies.

  Since libzmq/libsodium aren't required yet (I'm still using the old
  lumberjack publish protocol)

against logstash 1.1.13)

This has one slight behavioral change from the C version. We now
send a window size change before every spooled payload. This has
the effect of allowing slow publishers to be acknowledged sooner.

- restart any known files at their previous positions as recorded by the
registrar.

  certificate"` for worded json keys

for now)

fix zlib download URL

  cflags/ldflags outside of cgo.

- add server2

  (zmq+zlib+nacl); single-thread does 60000 'events' per second on my
  workstation