Use the "chosen" widget for the metric picker
Change the cluster-view heatmap to use a tiles instead of an image. Each cell represents a server. When you mouseover a cell you see the name of the server and its current load.
Small amount of code cleanup
Use the "chosen" widget for the metric picker
Merge remote branch 'upstream/master'
Merge pull request #211 from pcpiela/master

Use "Chosen" for metric picker, update cluster-view heatmap