revert the js evaluation in .box-shadow mixin, fix last mixin usages to escape if using >1 shadows

less/mixins.less

@@ -183,7 +183,7 @@
     .box-shadow(inset 0 1px 1px rgba(0,0,0,.075)); // Redeclare so transitions work
     &:focus {
       border-color: darken(@borderColor, 10%);
-      .box-shadow(inset 0 1px 1px rgba(0,0,0,.075), 0 0 6px lighten(@borderColor, 20%));
+      .box-shadow(~"inset 0 1px 1px rgba(0,0,0,.075), 0 0 6px lighten(@borderColor, 20%)");
     }
   }
   // Give a small background color for input-prepend/-append
@@ -248,12 +248,10 @@
 }
 
 // Drop shadows
-.box-shadow(@shadowA, @shadowB:X, ...){
-  // Multiple shadow solution from http://toekneestuck.com/blog/2012/05/15/less-css-arguments-variable/
-  @props: ~`"@{arguments}".replace(/[\[\]]|\,\sX/g, '')`;
-  -webkit-box-shadow: @props;
-     -moz-box-shadow: @props;
-          box-shadow: @props;
+.box-shadow(@shadow){
+  -webkit-box-shadow: @shadow;
+     -moz-box-shadow: @shadow;
+          box-shadow: @shadow;
 }
 
 // Transitions

less/navbar.less

@@ -202,7 +202,7 @@
 .navbar-fixed-top,
 .navbar-static-top {
   .navbar-inner {
-    .box-shadow(inset 0 -1px 0 rgba(0,0,0,.1), 0 1px 10px rgba(0,0,0,.1));
+    .box-shadow(~"inset 0 -1px 0 rgba(0,0,0,.1), 0 1px 10px rgba(0,0,0,.1)");
   }
 }
 
@@ -210,7 +210,7 @@
 .navbar-fixed-bottom {
   bottom: 0;
   .navbar-inner {
-    .box-shadow(inset 0 1px 0 rgba(0,0,0,.1), 0 -1px 10px rgba(0,0,0,.1));
+    .box-shadow(~"inset 0 1px 0 rgba(0,0,0,.1), 0 -1px 10px rgba(0,0,0,.1)");
   }
 }
 
@@ -446,7 +446,7 @@
       color: @white;
       background-color: @navbarInverseSearchBackground;
       border-color: @navbarInverseSearchBorder;
-      .box-shadow(inset 0 1px 2px rgba(0,0,0,.1), 0 1px 0 rgba(255,255,255,.15));
+      .box-shadow(~"inset 0 1px 2px rgba(0,0,0,.1), 0 1px 0 rgba(255,255,255,.15)");
       .transition(none);
       .placeholder(@navbarInverseSearchPlaceholderColor);