Added IVector tool and parallel algorithm.

bob/bio/gmm/algorithm/IVector.py

bob/bio/gmm/script/verify_isv.py

bob/bio/gmm/script/verify_ivector.py

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

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

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

bob/bio/gmm/tools/isv.py

bob/bio/gmm/tools/ivector.py

setup.py