Fix case sensitivity in rescue of exceptions

As this can differ across platforms.
Merge pull request #27 from alphagov/fix-case-sensitive-rescue

Fix case sensitivity in rescue of exceptions
Add aaib-reports.json schema

AAIB reports schema to finder api in order for other applications to use it. This will be required by specialist-frontend in order to build the correct labels for metadata attributes when displaying to the user.
Merge pull request #26 from alphagov/feature/add-aaib-schema

Add aaib-reports.json schema