Added license statements and also converted line endings to unix format

dlib/matlab/cmake_mex_wrapper

-# This file figured out where MATLAB is and then defines a macro, add_mex_function(name)
+# This file figures out where MATLAB is and then defines a macro, add_mex_function(name)
 # which when called instructs CMake to build a mex file from a file called name.cpp.  Note
 # that additional library dependencies can be added like this: add_mex_function(name lib1 dlib libetc).
 # That is, just add more libraries after the name and they will be build into the mex file.

dlib/matlab/example_mex_callback.cpp

+// The contents of this file are in the public domain. See LICENSE_FOR_EXAMPLE_PROGRAMS.txt
 
 #include "call_matlab.h"
 #include "dlib/matrix.h"

dlib/matlab/example_mex_function.cpp

+// The contents of this file are in the public domain. See LICENSE_FOR_EXAMPLE_PROGRAMS.txt
 
 #include "dlib/matrix.h"
 using namespace dlib;

dlib/matlab/mex_wrapper.cpp

+// Copyright (C) 2012 Massachusetts Institute of Technology, Lincoln Laboratory
+// License: Boost Software License   See LICENSE.txt for the full license.
+// Authors: Davis E. King (davis@dlib.net)
 /*
                                READ THIS FIRST
                                    ######