Fix logging redudancy on multiple instances #73
Merged
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When making multiple trackers (or re-instantiating as common in Notebook-like environments), each instantiation of CarbonTracker causes logging to duplicate messages. This is due to logger.getLogging always returning the same logging instance when called with the same argument (singleton-like). This is fixed by having each instance of CarbonTracker have a unique logging_id, which makes each instance have their own logger.
This solves issue #70