e412ed5850e072210e68dba7a701a3291c64e88c Fix: When using a CSS select…

…or for the column selector (`-api columns()`) the order is now guaranteed to be in column index order.

https://datatables.net/forums/discussion/80079

Sync to source repo @e412ed5850e072210e68dba7a701a3291c64e88c

datatables.json

@@ -14,5 +14,5 @@
     ],
     "src-repo": "http://github.com/DataTables/DataTablesSrc",
     "last-tag": "2.1.8",
-    "last-sync": "d7fdab4d358a0beff9bc8eaf0139ada406293255"
+    "last-sync": "e412ed5850e072210e68dba7a701a3291c64e88c"
 }