collectiveaccess/providence — pull request #61 by gautiermichelin (2013-12-20 06:40:13+00:00)
Title: PROV-743 : Watermark support with CoreImageTool

- CIStretchCrop to resize the watermark
- CIColorMatrix to modify watermark opacity
- CISoftLightBlendMode to blend images

Signed-off-by: gautiermichelin