Bugfix: HighlightView wasn't updated on rotation change

Problem:

Under certain circumstances you couldn't move the HighlightView to the edge of the image, when you have rotated the image:

Fix:

Call addHighlightView() on rotation change in order to refresh the HighlightView.
Merge pull request #1 from hig-ag/patch-1

Bugfix: HighlightView wasn't updated on rotation change