This class is used to create 'assets' for an 'asset pipeline', similar to the asset pipeline implemented by Ruby on Rails. It does the following:
- Delete old assets from destination folder (public/assets).
- Create new asset subfolders, if necessary.
- Process image files: calculate MD5 hashes, fingerprint, move to public/assets/img
- Concatenate css files, minimize, fingerprint and move to public/assets/css
- Write out assets.txt.
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