python_examples folder.

modules are built on windows.

on MS Windows since this avoids a few program shutdown bugs when dlib us used as
part of a DLL.  For example, when creating python modules with threading the interpreter
sometimes hangs on program shutdown as a result of trying to destroy the global
thread pool.  Note that not destroying this resource on program shutdown is the
recommended approach according to Microsoft.
see http://blogs.msdn.com/b/oldnewthing/archive/2012/01/05/10253268.aspx

Renamed numerical integration header to dlib/numerical_integration.h.  Changed relevant headers to include numerical_integration.h  Fixed documentation in integrate_function_adapt_simpson_abstract.h

Need to add documentation next.

Simpson rule.  Added unit tests and supporting examples for this
function.

which could occur when NaN valued inputs were given.