Update watch and mget to use array arguments

This is a small performance improvement since the `redis` module offers
a straight passthrough mode for command callbacks, since it does not
rely on parsing `arguments`.

index.js

@@ -112,9 +112,9 @@ Limiter.prototype.get = function (fn) {
   }
 
   function mget() {
-	  db.watch(count, function (err) {
+	  db.watch([count], function (err) {
 		  if (err) return fn(err);
-		  db.mget(count, limit, reset, function (err, res) {
+		  db.mget([count, limit, reset], function (err, res) {
 			  if (err) return fn(err);
 			  if (!res[0] && res[0] !== 0) return create();