Fix for issue 212. The load distribution heatmap would fail to be created for clusters with a number of hosts that did not have an exact integer square root.
Fix for issue 212. The load distribution heatmap would fail to be created for clusters with a number of hosts that did not have an exact integer square root.

torkelsson/ganglia-web,ganglia/ganglia-web,luckypoem/ganglia-web,ganglia/ganglia-web,torkelsson/ganglia-web,torkelsson/ganglia-web,torkelsson/ganglia-web,ganglia/ganglia-web,ganglia/ganglia-web,luckypoem/ganglia-web,ganglia/ganglia-web,torkelsson/ganglia-web,luckypoem/ganglia-web,luckypoem/ganglia-web,luckypoem/ganglia-web