add test for getting body measurements
add test for getting body measurements

AlexGhiondea/Fitbit.NET,WestDiscGolf/Fitbit.NET,AlexGhiondea/Fitbit.NET,aarondcoleman/Fitbit.NET,amammay/Fitbit.NET,WestDiscGolf/Fitbit.NET,AlexGhiondea/Fitbit.NET,aarondcoleman/Fitbit.NET,aarondcoleman/Fitbit.NET,amammay/Fitbit.NET,amammay/Fitbit.NET,WestDiscGolf/Fitbit.NET