addUsersFromList.py: script now writes results out to a file
addUsersFromList.py: script now writes results out to a file

Before the results were just printed at the command line
Now, they are also written to a new csv file, which will be in the same
directory as the input file. The name of the output file has the name of the
input file appended by "-output".

CSGreater-Developers/HMC-Grader,noellekimiko/HMC-Grader,CSGreater-Developers/HMC-Grader,CSGreater-Developers/HMC-Grader,noellekimiko/HMC-Grader,CSGreater-Developers/HMC-Grader,CSGreater-Developers/HMC-Grader,noellekimiko/HMC-Grader,noellekimiko/HMC-Grader,noellekimiko/HMC-Grader,noellekimiko/HMC-Grader