Coalesce, if needed, ing GifEncode()
Add Image.Compare and Image.IsEqual
Implement color space trasformation in GM
Make TransformColorspace not alter the source image

Also, add ToColorspace to perform the transformation in place.
Use path/filepath to load test files
Add support from creating images from in-memory data

This also includes creating new empty images of a given size.
Use filepath for encoding files during tests
Add support for ChannelImage() and ToChannelImage()
Rename Matrix to AffineMatrix

Although this is an incompatible change, I doubt that a lot of
people are using that type directly, so for now we'll not issue
a new version.
Add QuantumRange() and QuantumDepth()
Fix crash when transforming color spaces

The transformation functions return boolean, not the new image
Add support for Convolve()
Add experimental support for perceptual hash