upgrade dojo to 1.8.3 (refs #570)

lib/dijit/_base/sniff.js.uncompressed.js

@@ -0,0 +1,12 @@
+define("dijit/_base/sniff", [ "dojo/uacss" ], function(){
+
+	// module:
+	//		dijit/_base/sniff
+
+	/*=====
+	return {
+		// summary:
+		//		Deprecated, back compatibility module, new code should require dojo/uacss directly instead of this module.
+	};
+	=====*/
+});