update to bootstrap 4 stable

library/bootstrap/css/bootstrap-reboot.css

@@ -1,7 +1,7 @@
 /*!
- * Bootstrap Reboot v4.0.0-beta.3 (https://getbootstrap.com)
- * Copyright 2011-2017 The Bootstrap Authors
- * Copyright 2011-2017 Twitter, Inc.
+ * Bootstrap Reboot v4.0.0 (https://getbootstrap.com)
+ * Copyright 2011-2018 The Bootstrap Authors
+ * Copyright 2011-2018 Twitter, Inc.
  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
  * Forked from Normalize.css, licensed MIT (https://github.com/necolas/normalize.css/blob/master/LICENSE.md)
  */
@@ -147,7 +147,7 @@ a:not([href]):not([tabindex]) {
   text-decoration: none;
 }
 
-a:not([href]):not([tabindex]):focus, a:not([href]):not([tabindex]):hover {
+a:not([href]):not([tabindex]):hover, a:not([href]):not([tabindex]):focus {
   color: inherit;
   text-decoration: none;
 }
@@ -184,19 +184,6 @@ svg:not(:root) {
   overflow: hidden;
 }
 
-a,
-area,
-button,
-[role="button"],
-input:not([type="range"]),
-label,
-select,
-summary,
-textarea {
-  -ms-touch-action: manipulation;
-  touch-action: manipulation;
-}
-
 table {
   border-collapse: collapse;
 }
@@ -204,7 +191,7 @@ table {
 caption {
   padding-top: 0.75rem;
   padding-bottom: 0.75rem;
-  color: #868e96;
+  color: #6c757d;
   text-align: left;
   caption-side: bottom;
 }