Fixed missing #include <vector> in assimp.hpp. Thanks to Andy Maloney for the hint.

git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@256 67173fc5-114c-0410-ac8e-9d2fd5bffc1f

include/assimp.hpp

@@ -49,6 +49,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #endif
 
 #include <map>
+#include <vector>
 
 // Public ASSIMP headers
 #include "aiTypes.h"