removed ms prefix from box-sizing and added a test case

frameworks/compass/stylesheets/compass/css3/_box-sizing.scss

@@ -8,6 +8,6 @@
 @mixin box-sizing($bs) {
   $bs: unquote($bs);
   @include experimental(box-sizing, $bs,
-    -moz, -webkit, not -o, -ms, not -khtml, official
+    -moz, -webkit, not -o, not -ms, not -khtml, official
   );
 }

test/fixtures/stylesheets/compass/css/box-sizeing.css

@@ -0,0 +1,9 @@
+.div {
+  -webkit-box-sizing: content-box;
+  -moz-box-sizing: content-box;
+  box-sizing: content-box; }
+
+.div {
+  -webkit-box-sizing: border-box;
+  -moz-box-sizing: border-box;
+  box-sizing: border-box; }

test/fixtures/stylesheets/compass/sass/box-sizeing.scss

@@ -0,0 +1,8 @@
+@import "compass/css3/box-sizing";
+
+.div {
+  @include box-sizing(content-box);
+}
+.div {
+  @include box-sizing(border-box);
+}