Make tar-stream a TransformStream

I mentioned this previously, but I’d like to be able to use tar-stream in this manner (or similar):

intar.pipe(tarStream(onentry, onfinish)).pipe(transformedTar)

I made a feeble attempt to get this to work outside of tar stream in dockerify lazy-stream branch, but had only mixed success.

The tests that all passed previously now only pass in node 0.10. I hope though this can server as a start to figure out how the above could be achieved.

[chpio]

yeah, i needed that functionality too, that’s why i made the tar-vinyl-stream package, which consumes a tar stream and emits vinylobjects for each entry.

[piranna]

We should have here two transform objects, one for extract that consume a bytestream and emit data with stream objects, and another for pack that consume them and emit a bytestream. This probably would break API compatibility, so this should be a major version.