Corrections for compiling issues in Win, And and Doc

samples/cpp/shape_example.cpp

@@ -75,7 +75,7 @@ int main(int argc, char** argv)
     imshow("QUERY", queryToShow);
     moveWindow("TEST", 0,0);
     vector<Point> contQuery = simpleContour(query);
-    int bestMatch;
+    int bestMatch = 0;
     float bestDis=FLT_MAX;
     for ( int ii=1; ii<=20; ii++ )
     {

samples/cpp/shape_transformation.cpp

@@ -48,7 +48,7 @@ int main(int argc, char** argv)
     BFMatcher matcher(NORM_L2);
     vector<DMatch> matches;
     matcher.match(descriptors1, descriptors2, matches);
-    
+
     // drawing the results
     namedWindow("matches", 1);
     Mat img_matches;