add clockwise image rotation

[gkesaev]

No description provided.

[furushchev]

Thank you for the contribution!
I think you can get rotated images by any degrees by combining this node and image_rotate node.
Please check the documentation:http://wiki.ros.org/image_rotate

[gkesaev]

In my case running another node was not an option, so I thought I might not be alone.
Thank you for the suggestion, I'll definitely use image_rotate in future products.

So are you interested in this feature, should I improve on anything or just close the PR?

[awesomebytes]

If we were to support this I'd rather be able to rotate the image in all the available rotations from Opencv:

  cv::ROTATE_90_CLOCKWISE = 0,
  cv::ROTATE_180 = 1,
  cv::ROTATE_90_COUNTERCLOCKWISE = 2 

I see its usefulness, though. If you add that, I'd be happy to merge.