New: Bootstrap 4 integration with DataTables

- Bootstrap 4 is currently in beta so things can, and probably will
  still change. Bootstrap 4 packages for DataTables won't be made
  available until at least a beta release of Bootstrap 4.
- A few things have changed in Bootstrap 4 and rather than trying to
  make the exisiting Bootstrap files work for both BS3 and BS4 it makes
  sense to offer both. We'd need to detect which version of BS is loaded
  and that can be quite unreliable (and delayed since the body would
  need to be available).
- Pagingation requires a couple of classes, but no change in structure
- BS4 don't include icons any more, so need to use UTF8 arrows to show
  sorting (don't particularly want other dependencies, although it is
  easy to add with CSS if you want more icon control)
- Outstanding issue: The select element for paging control is not of a
  consistent height with the search input. This appears to be a
  Bootstrap issue: twbs/bootstrap#17194

Sync to source repo @105ba6c24a7959ca63d1c9ccfbb32010babf52d8

Author: AllanJard

datatables.json

@@ -8,6 +8,6 @@
         "js/dataTables.jqueryui.min.js"
     ],
     "src-repo": "http://github.com/DataTables/DataTablesSrc",
-    "last-sync": "f8c7bb55b5307de0185254367d69db00581574bd",
+    "last-sync": "105ba6c24a7959ca63d1c9ccfbb32010babf52d8",
     "last-tag": "1.10.10"
 }