scissors() fails with files that have spaces in them

[Hugheth]

Errors:

pdftk: Error: Unable to find file.
Error: Failed to open PDF file: 
   -
Errors encountered.  No output created.
Done.  Input errors, so no output created.

Steps to reproduce:

1. Take a basic working example like in the readme of this repo
2. Add spaces to input file name
3. Prints this obscure error

Frustratingly doing this: scissors( 'test\ input.pdf' ) also does not solve the issue, which seems pretty dumb

[cboulanger]

Sorry, both @tcr and I are not currently working on this project. I am happy to merge PRs with bug fixes.

[tcr]

@Hugheth If you can paste a minimal example of this failing I think we can point out a fix quickly. From a cursory glance I'm unsure where this could be failing.