[5.3] Backport fixes for image validation#17983
Merged
taylorotwell merged 4 commits intolaravel:5.3from Feb 18, 2017
vlakoff:image_validation_5.3
Merged
[5.3] Backport fixes for image validation#17983taylorotwell merged 4 commits intolaravel:5.3from vlakoff:image_validation_5.3
taylorotwell merged 4 commits intolaravel:5.3from
vlakoff:image_validation_5.3