Better error handling in pipes

[ehmicky]

When piping streams, streamx adds an error listener. This error listener is not cleaned up when the pipe ends (including due to an error).

streamx/index.js

Line 274 in 625ce37

pipeTo.on('error', onerror)

This is unlike Node.js streams, which do clean up any listener added by .pipe():

https://github.com/nodejs/readable-stream/blob/c85db76d4c41f64fd082c9263c3a918bec6f38a0/lib/_stream_readable.js#L639

This bug ends up creating some bigger problem with Gulp, explained here: gulpjs/gulp#2812

[mafintosh]

Feel free to open a pr that removes it after the stream has been fully torn down

[ehmicky]

Hi @mafintosh,

It turns out the problem was slightly different. I opened #94 with the actual issue.