Add some shell protection?

[neelsmith]

First manifest I tried was D'Orville 301 from Bodleian, and it looks like the montage command passed along a file name assembled from parts of the manifest that had both apostrophes and parentheses, to the unhappiness of the shell process. Protect some of these or otherwise generate shell-safe filenames?

[ryanfb]

As of https://github.com/ryanfb/iiif-dl/commit/66c2c10a9c63f952c00324baf02d08a28e242fc6, the only allowed characters in the output filename should be -.a-zA-Z0-9_, does that fix the issue for you?

[neelsmith]

Works for every shell I use!