Fixes #10921: Add support for input groups within button toolbars

* Floats any `.input-group` within a toolbar
* Simplifies the CSS to remove sibling selectors and instead use a
negative amrgin on the parent with only `margin-left`

See it in action: http://jsbin.com/aGEcUqAT/1/.

dist/css/bootstrap.css

@@ -3045,13 +3045,16 @@ input[type="button"].btn-block {
 .btn-group .btn-group + .btn-group {
   margin-left: -1px;
 }
-.btn-toolbar .btn-group {
+.btn-toolbar {
+  margin-left: -5px;
+}
+.btn-toolbar .btn-group,
+.btn-toolbar .input-group {
   float: left;
 }
-.btn-toolbar > .btn + .btn,
-.btn-toolbar > .btn-group + .btn,
-.btn-toolbar > .btn + .btn-group,
-.btn-toolbar > .btn-group + .btn-group {
+.btn-toolbar > .btn,
+.btn-toolbar > .btn-group,
+.btn-toolbar > .input-group {
   margin-left: 5px;
 }
 .btn-group > .btn:not(:first-child):not(:last-child):not(.dropdown-toggle) {

less/button-groups.less

@@ -37,19 +37,18 @@
 
 // Optional: Group multiple button groups together for a toolbar
 .btn-toolbar {
+  margin-left: -5px; // Offset the first child's margin
   &:extend(.clearfix all);
 
-  .btn-group {
+  .btn-group,
+  .input-group {
     float: left;
   }
-  // Space out series of button groups
   > .btn,
-  > .btn-group {
-    + .btn,
-    + .btn-group {
+  > .btn-group,
+  > .input-group {
     margin-left: 5px;
   }
-  }
 }
 
 .btn-group > .btn:not(:first-child):not(:last-child):not(.dropdown-toggle) {