pass the --binary option to git diff so that changes to images get populated to the ci server in patches
must also allow git diff to add prefix's otherwise git-apply chokes on applying the binary differences
update tests to match new git diff command
update readme to use `git apply` instead of `patch` in jenkins jobs
release 1.0.10
Merge pull request #3 from kevingessner/fix_diff

generate diffs for binary files (supercedes #2)