Correctly read blending range values
Handle slices with a new Factory method
Example to show slices data

Have added a slices to the file too
Gracefully fail when slices version is not 7 or 8
Spec to test handling slices as a resource

1. Should work for newer slices versions
2. Should not break for older versions
3. TODO: Should not break for no slices at all
Return empty array when no slices are present
Spec fix
Merge branch 'master' into image_merging