Basic integration test for reload API

Tests the logic within `main()`:`http.HandleFunc()`.
Don't accept reload requests to /.*

We should be specific about what we support. Perhaps this should be modified
to `/reload` at some point?
Change reload endpoint to /reload

So that it's name matches the intention/function.
Merge pull request #30 from alphagov/reload_api_integration_test

Reload API integration tests