Quick support different timezone through rails config.time_zone

read timezone from rails config, and configure graphite data fetch uri with timestamp associated with set timezone, and send timezone inforation along with request to graphite server
One thing I'm confused about: if I specify `h["tz"] = "UTC"` here directly, and set my Rails app to UTC, I still see the giant gap between my local timezone and UTC.

If I configure the Rails app to be Pacific time, and this says Pacific time, then things are only off by an hour (not great, but still)

I haven't looked at what Graphite is doing exactly, but I'm confused why this doesn't fix things if I want Rearview configured in all UTC.