Moved all data scaling functions to a dedicated Scaler object. #245
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This consolidates all data scaling functions to a single location in a dedicated object.
Touches functionality in training (BaseTrainer), testing (BaseTester), dataset (BaseDataset). Uncertainty sampling is affected because it requires an unscaled value for '0'. All child data classes in datazoo are affected because BaseDataset no longer accepts a scaler dictionary.
Preserves all backward compatibility for old scaler files EXCEPT that it removes support for scaler files that are 2 generations old (these files have keys labeled "camels_attrs').