Merge pull request #9286 from neilhem/3.0.0-wip

set img-circle class in percents

less/scaffolding.less

@@ -79,7 +79,7 @@ img {
 
 // Perfect circle
 .img-circle {
-  border-radius: 500px; // crank the border-radius so it works with most reasonably sized images
+  border-radius: 50%; // set radius in percents
 }