Fixed unicode decode issue with csv grades
Fixed unicode decode issue with csv grades

Edraak/edx-platform,Edraak/circleci-edx-platform,Edraak/circleci-edx-platform,Edraak/edx-platform,Edraak/edx-platform,Edraak/edx-platform,Edraak/edx-platform,Edraak/circleci-edx-platform,Edraak/circleci-edx-platform,Edraak/circleci-edx-platform