Merge pull request gabrielecirulli#96 from jimminning/patch-3

Update main.scss for -ms-user-select (IE)

Author: gabrielecirulli

style/main.scss

@@ -178,6 +178,7 @@ hr {
     -webkit-touch-callout: none;
     -webkit-user-select: none;
     -moz-user-select: none;
+    -ms-user-select: none;
 
     background: $game-container-background;
     border-radius: $tile-border-radius * 2;