Merge branch 'dask-pipelines' into 'master'

bob/learn/em/__init__.py

bob/learn/em/cpp/ISVMachine.cpp

bob/learn/em/cpp/ZTNorm.cpp

bob/learn/em/gmm_machine.cpp

bob/learn/em/include/bob.learn.em/ISVMachine.h

bob/learn/em/include/bob.learn.em/ZTNorm.h

bob/learn/em/isv_base.cpp

bob/learn/em/isv_machine.cpp

bob/learn/em/main.cpp

bob/learn/em/main.h

bob/learn/em/test/test_picklability.py

bob/learn/em/test/test_ztnorm.py

bob/learn/em/ztnorm.cpp

requirements.txt

setup.py