- Adds tests for the majority of the methods within InsuranceController.
- Simplifies the `InsuranceController.sendMail()` method so that the toDelete parameter is no longer required.
- Modifies `InsuranceController.findItemsToDelete()` to only process regular and attachment items when they exist.
- Modifies `InsuranceController.rollForDelete()` to return null in the event that the provided Trader can not be found.
