Can either be a list of full_object_detections or a single
full_object_detection. I couldn't get the vector type to work
for full_object_detection due to a template error.

Also, move the vectorize template into its own header to
stop having to declare it again in vector.

Also, change point x and y to be properties

#include statements to reflect this move.

--HG--
rename : tools/python/src/boost_python_utils.h => dlib/python/boost_python_utils.h
rename : tools/python/src/pyassert.h => dlib/python/pyassert.h
rename : tools/python/src/serialize_pickle.h => dlib/python/serialize_pickle.h