OptiPNG settings added to project settings.
Extracted a few methods: reuse and readability. Added some commented out NSLogs for debugging purposes.
Extract methods for -publishDirectory to create file list. Renamed param. Removed local app delegate var, only used once.
Cut -publishDirectory down to a small method, layering the different process in more abstraction levels. Moved original local vars down to the different extracted methods where they are actually needed.