Hello,

This is the third stab at native imagemagick support for emacs.

New features:
- :rotation image spec, to rotate image arbitrarily
- :width and :height, if you specify them image will be scaled to these
sizes
- :geometry and :crop, imagemagick specifyers for size and croping, see
imagemagick docs
- :index, show a particular image within an image archive format(its
possible to see a particular page in a pdf for instance)

Ok, those features work somewhat well. What doesnt work, and which I
would like some help with, is how to make emacs automagically recognize
that a image file type is handled by the imagemagick loader. There is
some half-baked code in the patch that doesnt work for this.

Heres some test code:

make && src/emacs -q --eval "(progn (insert \"mupp\")(put-text-property 1 2 'display (list 'image :file \"/tmp/24725.pdf\" :type 'imagemagick :index 0  :geometry \"50%\" :crop \"\" :rotation 90.0) ))"