Support navigation depth > 5

Author: jasonbekolay

app/styles/nav-stack.scss

@@ -46,20 +46,8 @@ $easing: cubic-bezier(.23, 1, .32, 1);
     box-sizing: border-box;
     overflow:hidden;
 
-    &-0 {
-      left: 0;
-    }
-    &-1 {
-      left: 20%;
-    }
-    &-2 {
-      left: 40%;
-    }
-    &-3 {
-      left: 60%;
-    }
-    &-4 {
-      left: 80%;
+    @for $i from 0 through 100 {
+      &-#{$i} { left: 20% * $i; }
     }
   }