gradetools 0.2.0

Minor changes

Added ability to leave a personalized feedback message in a student's feedback file without any grade associated
Prompting is neater
- prompt codes starting with digits are user made
- letter prompt options are options provided by gradetools (e.g. adding rubric items, noting issues, and providing personalized feedback)
Feedback files can now have the following extensions:
- Rmd
- md (for GitHub documents)
- docx (for Word documents)
- html
- pdf
Moved questions_to_grade argument before students_to_grade in assist_team_grading(), and assist_advanced_grading().
Moved questions_to_regrade argument before students_to_regrade in assist_grading()
temporary grade sheet is now called the grading progress log
Can push feedback and create GitHub issues for partially graded assignments
General feedback is not automatically regraded when regrading other assignment components