I set up a field group using the code as a reference and inserted your code into the template without making any changes to it. The result of my test is here: http://www.ssird7.com.php53-14.dfw1-2.websitetestlink.com/2015/08/18/hello-world/ and it’s working for me.
Here is the exported field group I created:
and here is the code in the template, which is just a copy of yours
