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Rename category boomerang => rt.
Overhaul metric definitions (THIS BREAKS DATA MAPPERS).
Begin overhauling data, still more to come.
Populate the normalisation map for restiming data.
Fix some small issues picked up by the unit tests.
Fix some of the broken unit tests.
Fix restiming data processing bugs.
Fix more unit tests.
Delete old pre-overhaul data normalisation code.
Update statsd data mapper to match new data format.
Fix undefined dereference in statsd mapper.
Start updating the statsd mapper unit tests.
Fix stupid data access bug in statsd mapper.
Fix bad event name.
Fix statsd mapper tests.
Merge pull request #12 from nature/data-overhaul

Overhaul the internal data structure for more uniformity and greater code re-use