Update prompter.py: add 'delimiter' argument

Signed-off-by: Michael LeCompte <michaelslec98@gmail.com>
Finish prompter.py

Signed-off-by: Michael LeCompte <michaelslec98@gmail.com>
Update prompter.py: change default delimiter to ', '

Signed-off-by: Michael LeCompte <michaelslec98@gmail.com>
Update prompter.py: add var_name argument

Signed-off-by: Michael LeCompte <michaelslec98@gmail.com>