Serializer for toilet codes.
Add API views for retrieving toilet codes.
Merge branch 'feature/issue-5-rest-api-for-issues' into feature/issue-4-rest-api-for-codes
Add tests for toilet code API views.
Add tests for SearchParams.
Add tests for bad search queries.
Use named variables in list comprehension for enhanced clarity (tx @rudigiesler).
Merge branch 'feature/issue-4-rest-api-for-codes' into develop