Add RAIB Finder

This commit adds the ability for Finder Frontend to present RAIB
results.

Ticket:
https://trello.com/c/wwrCuXqI/372-raib-finder-add-support-to-finder-frontend-for-registering-and-rendering-raib-reports-2
Merge pull request #100 from alphagov/raib-reports

Add RAIB Finder