remove @shadow instances and replace with escaped values, update mixins to not use a default value at all

less/mixins.less

@@ -70,11 +70,11 @@
 
 // Sizing shortcuts
 // -------------------------
-.size(@height: 5px, @width: 5px) {
+.size(@height, @width) {
   width: @width;
   height: @height;
 }
-.square(@size: 5px) {
+.square(@size) {
   .size(@size, @size);
 }
 
@@ -192,14 +192,14 @@
 // --------------------------------------------------
 
 // Border Radius
-.border-radius(@radius: 5px) {
+.border-radius(@radius) {
   -webkit-border-radius: @radius;
      -moz-border-radius: @radius;
           border-radius: @radius;
 }
 
 // Drop shadows
-.box-shadow(@shadow: 0 1px 3px rgba(0,0,0,.25)) {
+.box-shadow(@shadow) {
   -webkit-box-shadow: @shadow;
      -moz-box-shadow: @shadow;
           box-shadow: @shadow;
@@ -229,21 +229,21 @@
        -o-transform: scale(@ratio);
           transform: scale(@ratio);
 }
-.translate(@x: 0, @y: 0) {
+.translate(@x, @y) {
   -webkit-transform: translate(@x, @y);
      -moz-transform: translate(@x, @y);
       -ms-transform: translate(@x, @y);
        -o-transform: translate(@x, @y);
           transform: translate(@x, @y);
 }
-.skew(@x: 0, @y: 0) {
+.skew(@x, @y) {
   -webkit-transform: skew(@x, @y);
      -moz-transform: skew(@x, @y);
       -ms-transform: skew(@x, @y);
        -o-transform: skew(@x, @y);
           transform: skew(@x, @y);
 }
-.translate3d(@x: 0, @y: 0, @z: 0) {
+.translate3d(@x, @y, @z) {
   -webkit-transform: translate(@x, @y, @z);
      -moz-transform: translate(@x, @y, @z);
       -ms-transform: translate(@x, @y, @z);
@@ -255,7 +255,7 @@
 // Prevent browsers from flickering when using CSS 3D transforms.
 // Default value is `visible`, but can be changed to `hidden
 // See git pull https://github.com/dannykeane/bootstrap.git backface-visibility for examples
-.backface-visibility(@visibility: visible){
+.backface-visibility(@visibility){
 	-webkit-backface-visibility: @visibility;
 	   -moz-backface-visibility: @visibility;
 	    -ms-backface-visibility: @visibility;
@@ -297,7 +297,7 @@
 }
 
 // Resize anything
-.resizable(@direction: both) {
+.resizable(@direction) {
   resize: @direction; // Options: horizontal, vertical, both
   overflow: auto; // Safari fix
 }
@@ -313,7 +313,7 @@
 }
 
 // Opacity
-.opacity(@opacity: 100) {
+.opacity(@opacity) {
   opacity: @opacity / 100;
    filter: ~"alpha(opacity=@{opacity})";
 }