Constructor delegation is not allowed prior to C++11.

Instead of raising errors, G++ silently allows this on my system. Bugs that are introduced:
- vimba_camera_ptr_ always equals NULL
- When printed, opened_ values from {0, 2, 106}
Why is C++11 needed? ROS only supports C++03

There is no guarantee that C++03 and C++11 will stay ABI-compatible. It may break at anytime without prior notice because it only works "by chance" currently.