Merge branch '27-fix-casia-surf-tests' into 'master'

Resolve "fix CASIA-SURF tests"

Closes #27

See merge request !91
3 jobs for 30-no-use-of-existing-annotations-in-facecropalign in 21 minutes and 46 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #162696
docker
build_linux_36

00:11:19

59.0%
passed #162555
macosx
build_macosx_36

00:10:27

59.0%
passed #162554
docker
build_linux_36

00:26:31

59.0%