QLColorCode handles file paths with single quote (').

[daniele-orlando]

colorize.sh was failing trying to generate a preview for files with a single quote in their name (or path).

Example: The preview command for file "l'altro.sh" was generated like this: 'colorize.sh' '' '/l'altro.sh' '0' resulting in: qlmanage[66236]: QLColorCode: colorize.sh failed with exit code 2.