Remove "incremental" code from Logger

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## Problem

Initially it looked like the CloudWatch graphs in the AWS console were not displaying increments correctly. We discovered if we used the `sum` option then (over the course of a larger dataset) that the graph would start to take shape as we expected it to.

## Solution

We've done a couple of things. First was to remove the code that implemented its own way of incrementing values (as that was not needed in the end), and secondly we've placed the CloudWatch API code inside of a Thread to allow for maximum concurrency
Use the new Ruby 1.9 hash syntax.