Bug 922327 - Allow optionally setting a server prefix inside dashboard;r=davehunt

This makes it easier to modify the dashboard in-place, as you no longer need
to download the JSON data locally.
Bug 922343 - Support visualization of responsiveness data in dashboard;r=davehunt
Bug 921283 - Devices should should synchronize time with host machine, not pool.ntp.org;r=davehunt