Add directory walk

[ungeschneuer]

I added a directory walk to look for all PDFs from the base dir on.

[theeko74]

Thanks for the interest in the script.
If you really want to run the compressor on multiple pdf files why don't you do a loop with bash ? Sometimes I have multiple pdf files in my folder but I do not want to compress all so make it a default option makes stuff more difficult I think.

[ungeschneuer]

This is probably just another way of organizing files. I normally use this script when archiving a whole folder structure, so this makes more sense to me. However, you are right that this could also be achieved by a bash script.