Revert "migration to remove roll column from user if it exists"
Revert "migration to remove roll column from user if it exists"

This reverts commit 6235703bf43ab5ad6644381b2846b8403bb4c4a5.

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