Binding and redesigning the KMeansMachine class

bob/learn/misc/cpp/KMeansMachine.cpp

bob/learn/misc/include/bob.learn.misc/KMeansMachine.h

bob/learn/misc/kmeans_machine.cpp

bob/learn/misc/main.cpp

bob/learn/misc/main.h

bob/learn/misc/test_kmeans.py

setup.py