Quick and dirty copy pasta to implement getImagesBlob as a binding to MagickGetImagesBlob()
Copy function doc comment from MagickWand source (magick-image.c) per convention
Copy readGetImageBlob test to use for testing getImagesBlob on both an animated GIF (which can be gotten as a sequence) and a JPG (just a single image)
Merge pull request #25 from timmytofu/master

Provide access to MagickGetImagesBlob to get a whole sequence as a blob (e.g. for animated GIFs)