Removed -moz and -webkit prefixes for box-shadow mixin

Added -ms for box-shadow
Removed prefixes in border-radius mixin, as all modern browsers now support it unprefixed.

_mixins.scss

@@ -36,17 +36,18 @@
 	}
 }
 
+/* Did compatability check on May 25th, 2012, removed -moz and -webkit */
 @mixin box-shadow($x: 0, $y: 0, $blur: 0, $color: transparent, $inset: false) {
 	@if type-of($x) != list {
 		@if $inset {
-			@include experimental-property(-webkit -moz, box-shadow, inset $x $y $blur $color);
+			@include experimental-property(-ms, box-shadow, inset $x $y $blur $color);
 		}
 		@else {
-			@include experimental-property(-webkit -moz, box-shadow, $x $y $blur $color);
+			@include experimental-property(-ms, box-shadow, $x $y $blur $color);
 		}
 	}
 	@else {
-		@include experimental-property(-webkit -box, box-shadow, $x);
+		@include experimental-property(-ms, box-shadow, $x);
 	}
 }
 
@@ -57,34 +58,22 @@
 
 @mixin border-radius($radius: false, $topleft: false, $topright: false, $bottomright: false, $bottomleft: false) {
 	@if type_of($radius) == number {
-		@include experimental-property(-webkit -moz, border-radius, $radius);
+		border-radius: $radius;
 	}
 	@if type_of($topleft) == number {
-		-webkit-border-top-left-radius: $topleft;
-		   -moz-border-radius-topleft: $topleft;
-		        border-top-left-radius: $topleft;
+		border-top-left-radius: $topleft;
 	}
 	@if type_of($topright) == number {
-		-webkit-border-top-right-radius: $topright;
-		   -moz-border-radius-topright: $topright;
-		        border-top-right-radius: $topright;
+		border-top-right-radius: $topright;
 	}
 	@if type_of($bottomright) == number {
-		-webkit-border-bottom-right-radius: $bottomright;
-		   -moz-border-radius-bottomright: $bottomright;
-		        border-bottom-right-radius: $bottomright;
+		border-bottom-right-radius: $bottomright;
 	}
 	@if type_of($bottomleft) == number {
-		-webkit-border-bottom-left-radius: $bottomleft;
-		   -moz-border-radius-bottomleft: $bottomleft;
-		        border-bottom-left-radius: $bottomleft;
+		border-bottom-left-radius: $bottomleft;
 	}
 }
 
-@mixin box-sizing($value) {
-	@include experimental-property(-webkit -moz, box-sizing, $value);
-}
-
 @mixin transition($property: false, $time: 1s, $ease: linear) {
 	@if $property == none {
 		@include experimental-property(-webkit -moz -o, transition, none);