Patched imagefield_crop to provide a hook to change resolution.  #1557

Patch on d.o here:
http://drupal.org/files/imagefield_crop-hook_imagefield_crop_instance_alter-1915510-1.patch
os_slideshow uses new imagefield_crop hook #1557

Patched imagefield_crop so I can change resolutions on the fly whenever the field is added to a form.

New slides use widget's selected aspect ratio.  Editing old slides does too.
Merge branch 'SCHOLAR-3.x' of github.com:openscholar/openscholar into SCHOLAR-3.x