1.2.0

• Add Access-Control-Expose-Headers header if none is provided by server.
• Rename environment variables:
  SERVER_SCHEME -> REMOTE_SCHEME
SERVER_HOST -> REMOTE_HOST
SERVER_USERNAME -> REMOTE_USERNAME
SERVER_PASSWORD -> REMOTE_PASSWORD
SERVER_POST -> REMOTE_POST
LOCAL_BIND_IP -> LOCAL_HOST
• Now you can use just LOCAL_URI and REMOTE_URI same as HTTP_PROXY,
  this simplifies usage from console.