Nuke shadows around thumbnails

docs/assets/css/bootstrap.css

@@ -3986,8 +3986,6 @@ button.close {
   line-height: 20px;
   border: 1px solid #ddd;
   border-radius: 4px;
-  -webkit-box-shadow: 0 1px 3px rgba(0, 0, 0, 0.055);
-          box-shadow: 0 1px 3px rgba(0, 0, 0, 0.055);
   -webkit-transition: all 0.2s ease-in-out;
      -moz-transition: all 0.2s ease-in-out;
        -o-transition: all 0.2s ease-in-out;
@@ -3996,8 +3994,6 @@ button.close {
 
 a.thumbnail:hover {
   border-color: #428bca;
-  -webkit-box-shadow: 0 1px 4px rgba(0, 105, 214, 0.25);
-          box-shadow: 0 1px 4px rgba(0, 105, 214, 0.25);
 }
 
 .thumbnail > img {

less/thumbnails.less

@@ -10,13 +10,11 @@
   line-height: @line-height-base;
   border: 1px solid #ddd;
   border-radius: @border-radius-base;
-  .box-shadow(0 1px 3px rgba(0,0,0,.055));
   .transition(all .2s ease-in-out);
 }
 // Add a hover state for linked versions only
 a.thumbnail:hover {
   border-color: @link-color;
-  .box-shadow(0 1px 4px rgba(0,105,214,.25));
 }
 
 // Images and captions