fix: Update nginx config to use dynamic DNS resolution

- Replace upstream blocks with resolver directive
- Use variables for backend addresses to avoid startup errors
- Simplify configuration with single server block
- Add health check endpoint

server/api/node_modules/exit/.travis.yml

@@ -0,0 +1,6 @@
+language: node_js
+node_js:
+  - 0.8
+  - '0.10'
+before_script:
+  - npm install -g grunt-cli