Add a bytesRead property for readable is
useful in some use cases.
When user want know how many bytes read of
readable, need to caculate it in userland.
If encoding is specificed, get the value is
very slowly.
PR-URL: https://github.com/nodejs/node/pull/4372
Reviewed-By: Trevor Norris <trev.norris@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>