Add logging for Rollup KPIs and perf metrics

- Adds a log line for every request that has the X-Soda2-Rollup header
- Adds standard performance metrics for every request through CodaHale Metrics  (meters for every request type, histograms for request latencies)
- Adds histograms for non-rollup and rollup successful query latencies
- metrics are configurable - logging, JMX, and graphite reporters are all available
- Adds a `reStart` SBT command for very quick ad hoc testing cycles
Is this prefix based on matching existing metrics?  Is the intent it is different for each component in the stack?  If so, "soda server" may be too generic of a name... ?