PR: Add Stream Handling - Never Write if nothing got Readed

[frank-dspeed]

In any case, the file will be accessed and it's contents may be overwritten even if there's no actual read operation done (due to node.js streams buffering mechanisms).

[frank-dspeed]

Will add the Parts with some Observable FRP Sugar ;)

[MichalCz]

Hmm... That shouldn't happen. The write location should not exceed read location. You mean the buffer of the piped stream?

[MichalCz]

Please make sure to write a test in the first commit to show the issue. I think I see what you mean, but even if that's confirmed and fixed at done pointit will reoccur without a proper test. :)

Anyway your PR is welcome.