Handle extraction from all files in a directory about iocextract

[rshipp]

Go for it. The cli is an afterthought on my end, I only use the library - so if there's anything you want to change to make it fit your workflow better, its fine with me.

One note - the --input flag used to use the argparse builtins for file handling, which supports - as stdin, but I had to change to the current lambda because argparse dies when fed binary input. This piece can be fragile moving between Python 2/3 too, because of the unicode/str/bytes differences.

[deadbits]

Sounds good. thanks for the input too on potential argparse quirks - good to know ahead of time. I'll play around a bit so nothing breaks and throw in a PR

Personally I very much use the script instead of the library. I end up using little oneliners to act as my directory input currently... if adding the new input gives me too much trouble I might just close this and stick to shell scripting unless I see anyone else who also really wants this. If it's just really for myself I'll deal.