Allow setting a custom NGINX_URL
Allow setting a custom NGINX_URL

tonycoco/heroku-buildpack-ember-cli,tonycoco/heroku-buildpack-ember-cli,mrship/heroku-buildpack-ember-cli,mrship/heroku-buildpack-ember-cli,GabKlein/heroku-buildpack-ember-cli,tonycoco/heroku-buildpack-ember-cli,mrship/heroku-buildpack-ember-cli,GabKlein/heroku-buildpack-ember-cli,GabKlein/heroku-buildpack-ember-cli