DESCRIPTION
Generates suitable key=value strings for splunk metrics
USAGE
metricLogger({ns: "myapp.addtwonumbers", first: 1, second: 2}) => METRIC ns="myapp.addtwonumbers" first=1 second=2
DEEP__PREFIX
metricLogger({ns:"myapp.addtwonumbers", numbers: { first: 1, second: 2 }}, { deepPrefix: true } ) => METRIC ns="myapp.addtwonumbers" numbers__first=1 numbers+__second=2