Command & Act paper filter

Allows filtering by the official status of a publication.

Depends on rummager change: https://github.com/alphagov/rummager/commit/31445f86263eca59f5922ae68b0bb164a699ec1b & https://github.com/alphagov/rummager/commit/834f8e8e0d779b1b488f7ccbb4c2628fcb32a357 (already merged)

Implements: https://www.pivotaltracker.com/story/show/42624263