threshold_image().

object_detector constructor from python.  So now you can pack multiple
detectors into one object via the python API.

image_window in Python.

integer radius. Also made the circles centered on the center of the pixel at
their center when you zoom in.

norm regularization stuff to Python. This also includes adding
num_separable_filters() and threshold_filter_singular_values() to the Python API.

shape_predictor_trainer.

to allow for parallel execution of the objective function calls.

The 4 bytes starting from the 0x06 offset of a bmp file are marked as
'Reserved' but it doesn't guarantee that these bytes are zeroed, some
applications uses this area for its own purposes and the output file
still a valid bmp file.