avoid compiler warnings.

if the input xml file contained unannotated images.

Fixed cudnn_hint_path detection for OSX where CUDA_CUBLAS_LIBRARIES is a list, not a single string. (#230)

let an exception sit in a thread pool and don't handle it before the
thread pool is destroyed.

training thread) out of the object into the calling code rather than
terminating the application.

Detecting C++11 capabilities did not work on OSX 10.11.6, XCode 7.3.1, Apple LLVM 7.3.0, cmake 3.6.1. First check revealed that CMAKE_CXX_KNOWN_FEATURES was empty, so subsequent matches failed. After reading http://public.kitware.com/pipermail/cmake/2014-November/059182.html changed handling to fetch property instead of relying on variable. Works on my machine.

older versions of Visual Studio.  This is because C++11 support is too bad in older versions
of Visual Studio.

what it was when this example was trained (since I just modified the default
value in dlib to something else).

code a little.

batch normalization running stats window size from 1000 to 100.

instead of rectangle.