Make fallback from MongoDB to in-memory storage configurable #16
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We run Mailhog instances in preprod environments where we run a single replica along with a single Mongo container in Kubernetes/Openshift. When spinning up a new instance of Mailhog, the database is not always ready when Mailhog starts.
This PR allows Mailhog to crash if it's unable to connect to Mongo instead of falling back to in-memory storage. This is desirable for us since Kubernetes will back-off/retry until the database is ready.