Hello again 
As part of our effort to migrate Gazebo and Ignition to BitBucket [1], we’ll also be moving the ros_ign repository to the Ignition Robotics organization on GitHub.
- Old URL: https://github.com/osrf/ros_ign
- New URL: https://github.com/ignitionrobotics/ros_ign
As described on GitHub’s documentation, all links to the old repository will remain valid, but it’s 
highly recommended that all users update their links.