* feat: basic models for appeals
* fix: modify appeal model to point to group
* fix: explicit date on Appeal objects
* feat: appeals importing management command
* feat: display appeals
* feat: admin for appeals
* fix: limit admin contentype choices
* feat: tastypie resources
* feat: factories and tests
* chore: update group migration
* fix: remove charset from pdf content type
* test: unittest download_name
* fix: admin for new name
