Command line output

[manthey]

I'd like to have a command line output option where it would print how many images are being redacted and the simple progress (e.g.,
"Redacting 1/25: , 0.00% done"
"Redacting 2/25: , 4.00% done"
). That percent done would ideally be based on the size of the input files, not the file count.

Currently, the run command is silent unless we add -v, at which point it is noisy. I'm looking for an informative middle ground.

[naglepuff]

Closing in favor of #216