Create a valid OutgoingMessage factory
Replace existing PublicBodyCategories functionality with db models PublicBodyCategory and PublicBodyHeading
Use translation tables for PublicBodyCategory and PublicBodyHeading
Fix admin screen formatting issue in Chrome
Basic category admin screen
Restrict category_tag edits to empty public body categories
List categories without headings on the admin screen
Enable admins to link public body categories to headings
Set default font for admin navbar throughout site
Reinstate automatic loading of categories on get if no categories defined
Add display order to public body categories and headings
Allow deletion of public body categories with associatied bodies
Add upgrade notes for category editing feature
Add display_order field to public_body_headings.

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Destroy link on destruction of heading or category.
Validation of display order, default setting callbacks.
Remove dependence on default public bodies.

Seems like this could trip us up later. Use factories instead, they're more clearly associated with tests.
Add actions for reordering public body headings and categories.
New heading associations should be added on category create.
Allow reordering of categories and headings using javascript.