Ensured that mapping documentation is built before every GET

This patch fixes such a minor issue:
- start up the web app
- make sure you _don't_ GET the resource listing (`curl localhost:8080/swagger-springmvc-test/api-docs`)
- instead, do GET the particular documentation resource, e.g. `curl localhost:8080/swagger-springmvc-test/api-docs/api/examples`
- and what you see is an empty response