Merge branch 'image-folder' into 'master'

bob/ip/binseg/configs/datasets/imagefolder.py

bob/ip/binseg/configs/datasets/imagefolderinference.py

bob/ip/binseg/configs/datasets/imagefoldertest.py

bob/ip/binseg/data/imagefolder.py

bob/ip/binseg/data/imagefolderinference.py

bob/ip/binseg/engine/inferencer.py

bob/ip/binseg/engine/predicter.py

bob/ip/binseg/script/binseg.py

bob/ip/binseg/utils/checkpointer.py

bob/ip/binseg/utils/plot.py

doc/api.rst

doc/configs.rst

doc/datasets.rst

doc/evaluation.rst

requirements.txt

setup.py