Merge branch 'refactor' into 'master'

bob/pipelines/__init__.py

bob/pipelines/config/distributed/dask_it_pipeline.py

bob/pipelines/config/distributed/local_parallel.py

bob/pipelines/distributed/__init__.py

bob/pipelines/distributed/sge.py

bob/pipelines/distributed/sge_queues.py

bob/pipelines/mixins.py

bob/pipelines/sample.py

bob/pipelines/scripts/__init__.py

bob/pipelines/scripts/pipelines.py

bob/pipelines/tests/__init__.py

bob/pipelines/tests/test_samples.py

bob/pipelines/tests/test_utils.py

bob/pipelines/tests/test_wrappers.py

bob/pipelines/transformers/__init__.py

bob/pipelines/transformers/function.py

bob/pipelines/transformers/linearize.py

bob/pipelines/transformers/pca.py

bob/pipelines/utils.py

bob/pipelines/wrappers.py