f4fd538c7762d39b7ee35a5ee35818601a44f4d7 Fix: -init tabIndex wasn't…

… being obayed for the column headers

https://datatables.net/forums/discussion/80343/

Sync to source repo @f4fd538c7762d39b7ee35a5ee35818601a44f4d7

datatables.json

@@ -14,5 +14,5 @@
     ],
     "src-repo": "http://github.com/DataTables/DataTablesSrc",
     "last-tag": "2.1.8",
-    "last-sync": "03245f43bc4e47338edc27cb0391a61150fb5265"
+    "last-sync": "f4fd538c7762d39b7ee35a5ee35818601a44f4d7"
 }