buttons and button group flattening improvements

less/button-groups.less

@@ -2,6 +2,11 @@
 // Button groups
 // --------------------------------------------------
 
+// Button carets
+.caret {
+  border-top-color: #fff;
+  border-bottom-color: #fff;
+}
 
 // Make the div behave like a button
 .btn-group {
@@ -124,9 +129,7 @@
   margin-top: 6px;
 }
 .btn-large .caret {
-  border-left-width:  5px;
-  border-right-width: 5px;
-  border-top-width:   5px;
+  border-width: 5px;
 }
 .btn-mini .caret,
 .btn-small .caret {
@@ -138,22 +141,6 @@
 }
 
 
-
-// Account for other colors
-.btn-primary,
-.btn-warning,
-.btn-danger,
-.btn-info,
-.btn-success,
-.btn-inverse {
-  .caret {
-    border-top-color: #fff;
-    border-bottom-color: #fff;
-  }
-}
-
-
-
 // Vertical button groups
 // ----------------------