fixed path aliases, so that the extension can be placed anywhere without additional configuration
added realpath output for files in info command action
added asset file mapping parameter to define files which are remapped after package compression
added optional experimental feature for copying CSS images to output-folder on package compression
Merge branch 'update-realpath'
Merge branch 'feature-copy-css-images'
Merge branch 'update-assets-script-map'

Conflicts:
	PackageCompressor.php