test_advanced_image_processing: Added test for extract_neurons from advanced_image_processing. This fixes #123.
test_advanced_image_processing: Added test for extract_neurons from advanced_image_processing. This fixes #123.

jakirkham/nanshe,nanshe-org/nanshe,DudLab/nanshe,nanshe-org/nanshe,jakirkham/nanshe,DudLab/nanshe