Represent relationships in the models.
Allow system, issuer, or program ID on badges.
Better validation.
Add `webhook` to system model.
Implement parent relationships.
Implement /system/<slug>/issuers
Implement issuer-specific program listing.
Get all badges for specific programs.
Get all badges for issuers, including sub programs
Remove unused assertion
Whitespace cleanup
Factor out map function `value`.
Show parent data in relationship'd badges.
Fix badge routes test

* Test for conflicts on POST
* Update active badges list.
Add logger.
Begin using `system` middleware.
Use middleware in all system routes.
Flip default for relationships in findSystem middleware
Reorganize
Abstract finder creation.