include decoupled join /close #135

# Conflicts:
#	mlair/data_handling/data_generator.py
#	mlair/data_handling/data_preparation_join.py
#	mlair/run_modules/experiment_setup.py
#	mlair/run_modules/post_processing.py
#	test/test_data_handling/test_bootstraps.py
#	test/test_data_handling/test_data_distributor.py
#	test/test_data_handling/test_data_generator.py
#	test/test_data_handling/test_data_preparation.py
#	test/test_modules/test_model_setup.py
#	test/test_modules/test_pre_processing.py
#	test/test_modules/test_training.py