added options to disable assigning mediafiles to proposals
moved staticpages module to new branch
mediafile model: more DRY
mediafile: test __repr__
model: mediafiles to comments assignment.
Restrict .gitignore

User more absolute paths, especially for generic names which also appear
in folders which should be tracked (e.g. `lib`).
Add missed file lib/helpers/adhocracy_service.py
ui to add images comments (javascript only)
adhocracy_kotti_medicenter: new image scales
mediacenter cleanup
mediacenter: readded functional test/docu
mediafile: try to get tags support work right
Fix: get query_string with list values is not working
Use multiple query parameters with same name

This makes a nicer API then using JSON encoded query strings.

See PR mozilla-services/cornice#141.