The doc says

	// Unlike io.Writer.Write, Endpoint.Write transfers ownership of any bytes
	// successfully written to the Endpoint. That is, if a call to
	// Write(SlicePayload{data}) returns (n, err), it may retain data[:n], and
	// the caller should not use data[:n] after Write returns.

but the signature of Write has since changed. It no longer accepts a slice payload, so this

currently we have:

could not parse
failed to parse
error parsing
failed to read file ...
fail to scan

We should unify the error messages.

Add contributors list format:
Name, user github

Load file / directory monitoring rules from yaml config and use to generate this part of the agent sensor subscription: https://github.com/dustin-decker/threatseer/blob/master/server/daemon/subscription.go#L32