allow p.a.imaging scales and make rel attribute configurable
p.a.imaging renders alt text and umlauts in  article title broke viewlet rendering
implement scales logic in ITeaser. requires less adaptions in browser code and allows re-use in other components such as raptus.article.listings
cleanup whitspace and imports
update documentation
officially add getScale to the interfaces so we can use it in other packages (eg to decide if we want to show the link to the cropping editor
Merge pull request #3 from webmeisterei/cropping

allow p.a.imaging scales and make rel attribute configurable
Preparing release 2.0b12
Back to development: 2.0b13