fix for RangeError stack size exceeded

This error would happen when there was a problem connecting to the local
server. The local.on('error') handler should have been a 'once' handler
because we emit the error again if it isn't a CONNREFUSED. So in the
case of a CONNRESET, it would trigger an infinite loop since the error
was being emitted back onto the local variable. Instead we just close
the remote socket and let a new one takes its place.

fixes #36