Refs #8060, use bounce_rate metric directly in visitor map instead of...

Refs #8060, use bounce_rate metric directly in visitor map instead of calculating using bounce_count (which has to manually requested), and correctly format bounce_rate values in the legend. Bounce rate values must be converted to ints immediately after loading, since API.getProcessedReport will always format percents, and UserCountryMap uses them as if they are integers.