Fix error CorePlot 2.0 uses NSNumber instead of NSDecimal
Fix error CorePlot 2.0 uses NSNumber instead of NSDecimal

https://github.com/core-plot/core-plot/releases
For a cleaner public API and ease of use from Swift, all public properties and methods that take NSDecimal values have been changed to take NSNumber values instead.

DiabetesCompass/Diabetes_Compass,DiabetesCompass/Diabetes_Compass