SEVENTVWEB-35: (psdcontentclassimport) Update package directory handling
* add ini setting for package directory
* use path from ini if no path is given
SEVENTVWEB-35: (psdcontentclassimport) Set some options to optional
SEVENTVWEB-35: (psdcontentclassimport) Handling for single packages
SEVENTVWEB-35: (psdcontentclassimport) Review changes
Merge pull request #8 from p7s1digital/psdcontentclassimport/SEVENTVWEB-35-7tv-contentclass-import

SEVENTVWEB-35: (psdcontentclassimport) Update package directory handling