add example for atlas.offset var
Merge pull request #42 from brharrington/offset-example

add example for atlas.offset var
use hash instead of position for file name
Merge remote-tracking branch 'nflx/master' into example-hash
update expected files for example images
Merge pull request #43 from brharrington/example-hash

Example hash
remove old image files
Merge pull request #44 from brharrington/delete-old-images

remove old image files