Reads a roster CSV and runs create_student_repo() for each student,
then returns a data frame summarizing the status for each repo.
Arguments
- roster_csv
Path to a CSV with a column named "handle".
- files_dir
Local folder with contents that will pushed into each repo.
- prefix
Assignment prefix. Each repo is named prefix-student.
- permission
Collaborator permission, "push" or "admin".
- pause
Seconds to wait between students, to stay clear of rate limits.