update assets from bootstrap@3.3.7

assets/less/bootstrap/thumbnails.less

@@ -1,7 +1,10 @@
+// stylelint-disable selector-no-qualifying-type
+
 //
 // Thumbnails
 // --------------------------------------------------
 
+
 // Mixin and adjust the regular image class
 .thumbnail {
   display: block;
@@ -11,13 +14,13 @@
   background-color: @thumbnail-bg;
   border: 1px solid @thumbnail-border;
   border-radius: @thumbnail-border-radius;
-  .transition(border 0.2s ease-in-out);
+  .transition(border .2s ease-in-out);
 
   > img,
   a > img {
     &:extend(.img-responsive);
-    margin-left: auto;
     margin-right: auto;
+    margin-left: auto;
   }
 
   // Add a hover state for linked versions only