Once per-connection response times are collected/calculated (in #48), plot the response times as heat maps. <bountysource-plugin> --- Want to back this issue? **[Post a bounty on it!](https://www.bountysource.com/issues/62897760-plot-heat-maps-of-per-connection-resonse-times?utm_campaign=plugin&utm_content=tracker%2F10143345&utm_medium=issues&utm_source=github)** We accept bounties via [Bountysource](https://www.bountysource.com/?utm_campaign=plugin&utm_content=tracker%2F10143345&utm_medium=issues&utm_source=github). </bountysource-plugin>