replaced boost smart pointers with c++11 smart pointers

code/XFileExporter.cpp

@@ -51,7 +51,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "DefaultIOSystem.h"
 #include <ctime>
 #include <set>
-#include <boost/scoped_ptr.hpp>
+#include <memory>
 #include "Exceptional.h"
 #include "../include/assimp/IOSystem.hpp"
 #include "../include/assimp/scene.h"
@@ -81,7 +81,7 @@ void ExportSceneXFile(const char* pFile,IOSystem* pIOSystem, const aiScene* pSce
     XFileExporter iDoTheExportThing( pScene, pIOSystem, path, file, &props);
 
     // we're still here - export successfully completed. Write result to the given IOSYstem
-    boost::scoped_ptr<IOStream> outfile (pIOSystem->Open(pFile,"wt"));
+    std::unique_ptr<IOStream> outfile (pIOSystem->Open(pFile,"wt"));
     if(outfile == NULL) {
         throw DeadlyExportError("could not open output .x file: " + std::string(pFile));
     }