modified regrading script to change raw score, examscore and lateness
update regrade help msg (#2045)
Handle ExamScore = None case by creating
Merge branch 'jbau-regrader' of https://github.com/Stanford-Online/class2go into jbau-regrader
Merge pull request #2078 from Stanford-Online/jbau-regrader

modified regrading script to change raw score, examscore and lateness