Feature request: http response output processing plugins

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We run a variety of systems that return image data that we would like to be able to monitor with blackbox. Our ArcGIS devs are monitoring them right now using a homegrown Python script that reads the returned image and uses .getcolors() to get a count of individual colors in the image.

It would be great to have a feature that could send the output from a probe either as STDIN to another external program, or as POST data to a configured web service so that the output payload can be analyzed more thoroughly than what we can do with regular expressions.