Training on Windows

[iamsurya]

FYI, if you run this code on windows, you are effectively iterating 2X times.

The code example was based on linux which has case sensitive filenames. Since windows does not, the create_image_lists() function returns a list containing the filenames with JPEG and jpeg.

Change line 611 of retrain.py from extensions = ['jpg', 'jpeg', 'JPG', 'JPEG'] to extensions = ['jpg', 'jpeg'] to avoid training twice.