[CCV] Changed signature of get feature map method

Signed-off-by: Jim Martens <github@2martens.de>

ccv/saliency/includes/oriented_pyramid.h

@@ -50,7 +50,7 @@ public:
      * @param orientation the nth orientation
      * @return the feature map
      */
-    cv::Mat get_feature_map(int orientation);
+    cv::Mat get_feature_map(unsigned long orientation);
 };