nav, buttons, and docs updates to account for outline: 0; on :active

less/dropdowns.less

@@ -5,10 +5,14 @@
 .dropdown {
   position: relative;
 }
-.dropdown .dropdown-toggle {
+.dropdown-toggle {
   // The caret makes the toggle a bit too tall in IE7
   *margin-bottom: -3px;
 }
+.dropdown-toggle:active,
+.open .dropdown-toggle {
+  outline: 0;
+}
 // Dropdown arrow/caret
 .caret {
   display: inline-block;