fix issue where ScoreRecalculator was getting @student_id instead of @student.id
fix issue where ScoreRecalculator was getting @student_id instead of @student.id

UM-USElab/gradecraft-development,UM-USElab/gradecraft-development,mkoon/gradecraft-development,UM-USElab/gradecraft-development,UM-USElab/gradecraft-development,mkoon/gradecraft-development,mkoon/gradecraft-development