added include <map> as the std::map is needed in this file

git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@205 67173fc5-114c-0410-ac8e-9d2fd5bffc1f

include/assimp.hpp

@@ -47,6 +47,8 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #	error This header requires C++ to be used.
 #endif
 
+
+#include <map>
 // public ASSIMP headers
 #include "aiTypes.h"
 #include "aiConfig.h"