that it's going to move the matrix into the result.

* Fixed reference count issue

* Fixed refcount issue in Python dlib.jitter_image and dlib.get_face_chips

* Consolidation of https://github.com/davisking/dlib/pull/1249

* Fixed build issue

* Fixed: Paths in a pytest file should be relative to dlib root

* Skip numpy return tests for Python 2.7 or if Numpy is not installed

* Enabled numpy returns tests on Python 2.7 using cPickle.dumps

* Fixed reference count issue

* Fixed refcount issue in Python dlib.jitter_image and dlib.get_face_chips

* prevent C++ compilation flags leaking to CUDA

* disable compilation flags leak fix for old cmake on windows

* disable compilation flags leak fix for cmake older than 3.3

Improved the stopping condition of solve_qp_box_constrained() and solve_qp_box_constrained_blockdiag().