added countsamp to gmql ace language definition.

Author: acanakoglu

lib/ace/mode/gmql_highlight_rules.js

@@ -63,7 +63,8 @@ var GmqlHighlightRules = function() {
 			+ "|joinby" //DIFFERENCE
 			+ "|aggregate" //COVER(flat/summit/histogram
 			+ "|output" //JOIN
-			+ "|into" //MATERIALIZE
+            + "|into" //MATERIALIZE
+            + "|countsamp"
 			//+ "|parser|region_modifier|meta_modifier|meta_project"
     );