PSDEZONE-516: Implemented --clean-up functionality for removing undefined content-classes from CMS.

Implemeted psdPackageRepository for --clean-up and --update-status options.
Replaced eZArchive for extracting ezpkg-files with PharData, because eZArchive constantly failed.
PSDEZONE-516: Covers added and removed packages when asking or `--update-status`.
Updated head-comment in psdPackageRepository.php
Merge pull request #2 from olivererdmann/psdezone-206-psdcontentclassimport-cleanup

PSDEZONE-516: Implemented --clean-up functionality for removing undefine...