_borders.scss in bootstrap-4.0.0

- old
+ new

@@ -2,10 +2,15 @@
 
 //
 // Border
 //
 
-.border          { border: $border-width solid $border-color !important; }
+.border         { border: $border-width solid $border-color !important; }
+.border-top     { border-top: $border-width solid $border-color !important; }
+.border-right   { border-right: $border-width solid $border-color !important; }
+.border-bottom  { border-bottom: $border-width solid $border-color !important; }
+.border-left    { border-left: $border-width solid $border-color !important; }
+
 .border-0        { border: 0 !important; }
 .border-top-0    { border-top: 0 !important; }
 .border-right-0  { border-right: 0 !important; }
 .border-bottom-0 { border-bottom: 0 !important; }
 .border-left-0   { border-left: 0 !important; }