Updated GMM algorithm and implemented parallel UBM training

bob/bio/gmm/algorithm/GMM.py

bob/bio/gmm/config/algorithm/gmm.py

bob/bio/gmm/config/algorithm/isv.py

bob/bio/gmm/script/__init__.py

bob/bio/gmm/script/verify_gmm.py

bob/bio/gmm/test/data/scores-nonorm-gmm-dev

bob/bio/gmm/test/data/scores-ztnorm-gmm-dev

bob/bio/gmm/test/dummy/__init__.py

bob/bio/gmm/test/dummy/extractor.py

bob/bio/gmm/test/test_algorithms.py

bob/bio/gmm/test/test_scripts.py

bob/bio/gmm/tools/__init__.py

bob/bio/gmm/tools/command_line.py

bob/bio/gmm/tools/gmm.py

setup.py