Add wrapper for AutoOrientImage() #22
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I call the wrapper function AutoOrient().
This emulates the +repage command line argument. This is useful to call after cropping. For more information about this, see http://www.imagemagick.org/script/command-line-options.php#repage and http://www.imagemagick.org/Usage/crop/#crop_page
Also add a test demonstrating PlusRepage(). To do this I add functions to access the virtual canvas information.
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I added a new public function to the Image type to call the MagickCore API function AutoOrientImage().
I noticed there is an open issue, #13, which asks for this too.
I've used it and added tests and it works well. Specifically why I wanted it is I found some JPGs I have to not display with the correct orientation when placed in HTML.
Please let me know if you would like me to change anything.
Thank you!