feat(stdin): standard stdin pipe works

- removed node < 0.10 compat
- removed uneeded code around destroys.
- added standard stdin input feat
- updated readme

Both use cases were tested against a [dshaw/replify](https://github.com/dshaw/replify) instance without
any errors.

`echo "command" | rc` is usefull to be able to mimic `echo "command" | nc`.

I know I am inserting some breaking changes and deleting code but so far
it just works for us.

Feel free to close this if inappropriate.