Don't run Rack::Attack for Enterprise. (#287)
Don't run Rack::Attack for Enterprise. (#287)

On enterprise, the reverse proxy is not correctly set up, and therefore the client IP address not passed through properly. For that reason, all requests look like they originate from the same client, and if one gets blocked, everyone gets blocked.
travis-ci/travis-api,travis-ci/travis-api,travis-ci/travis-api