Add a paragraph on getting data from a child process.

[chrisdew]

I had a problem getting data from a child process using a pipe. Please feel free to add a paragraph based on my problem and solution. (Consider code public domain / MIT if it matters.)

http://stackoverflow.com/questions/14751504/capture-a-child-processs-stdout-with-libuv/14753057#14753057

[nikhilm]

thanks! Will work on this over the weekend

[nikhilm]

This issue could use a PR. I don't see myself doing this right now.