Sort targets on the status page.

Change-Id: I6b59c97ab50093c50b608e29be2304475bc5d9f6
Upgrade rickshaw to v1.5.1

This includes better handling for missing data points in stacked graphs.
Merge pull request #430 from brian-brazil/sort-status

Sort targets on the status page.
Merge pull request #433 from brian-brazil/upgrade-rickshaw

Upgrade rickshaw to v1.5.1
Fix regression from 5e8d57bec1a21c39b55f20c67425c065405f8153

0 is a false value, so shortcutting no longer works.
Update other places in the code that assumed graph was the default.