Implement Redact selection everywhere

Refactor RedactsNotices to work with instances

* Instances provide the needed flexibility to redact static text
* Allows us to prefer composition over inheritance

Update RedactProc to delegate to real classes
Add Jurisdiction via ActsAsTaggableOn

* Lowercase tags by overriding Notice#tags_list=
* Add jurisdictions via the web through the form.
* Add tags and jurisdictions to json serializers.
* Update docs for jurisdictions and tags
* Update seed data.
WIP