added mediafile migration script
adhocracy_kotti_theme: added bootstrap.min.css
added adhocracy_kotti to adhocracy_service/kotti
adhocracy_kotti: cleanup
adhocracy_kotti: Fix image scaling is not working right
mediafile: added backref mappings
edit and show proposal mediafile
Fix: wrong image url
server adhocracy and adhocracy_service/kotti in one WSGI process
adhocracy_kotti: fix tests
added options to disable assigning mediafiles to proposals