Some additions to aos/vision/blob (transpose and move_scale).

Change-Id: I927144e27d0494f3ea879ebbd1647741f82e3c7b
diff --git a/aos/vision/blob/hierarchical_contour_merge.cc b/aos/vision/blob/hierarchical_contour_merge.cc
index b3d9f41..ec617ca 100644
--- a/aos/vision/blob/hierarchical_contour_merge.cc
+++ b/aos/vision/blob/hierarchical_contour_merge.cc
@@ -22,7 +22,7 @@
 
   // This is an exclusive range lookup into a modulo ring.
   // The integral is precomputed in items_ and is inclusive even though
-  // the input is [a, b). 
+  // the input is [a, b).
   T Get(int a, int b) {
     a = Mod(a, items_.size());
     b = Mod(b, items_.size());