Request: Support for piped YAML

[Kerrick]

I'd really like if I could pipe a YAML string to the beats executable, and have it treat that YAML as the INPUT_YAML_FILE if none is specified.

For example, in addition to being able to do this:

beats --path="./" tmp/word.beats.txt

It'd be great to be able to do something like this:

cat tmp/word.beats.txt | beats --path="./"

[jstrait]

Thanks for the suggestion! That sounds like a good feature. I'll start taking a look into the feasibility and get back to you soon.