Merge pull request twbs#241 from asecondwill/master

Multiple shadows

Author: thomas-mcdonald

vendor/assets/stylesheets/bootstrap/_mixins.scss

@@ -245,7 +245,7 @@
 }
 
 // Drop shadows
-@mixin box-shadow($shadow) {
+@mixin box-shadow($shadow...) {
   -webkit-box-shadow: $shadow;
      -moz-box-shadow: $shadow;
           box-shadow: $shadow;