Adding sum of squares and rmse attributes to calibration report attributes

"utility_bill1_rmse" : 35.9552,
"utility_bill1_rmse_units" : "therms^0.5",
"utility_bill1_sum_of_squares" : 16806.1,
"utility_bill1_sum_of_squares_units" : "therms"
Merge branch 'develop' of github.com:NREL/OpenStudio-analysis-spreadsheet into develop