Tracking download

I made following update. 

* [x] Update Google analytics tracking code
* [x] Make download linke generates event

if i run jekyll serve --watch 
download event generation fail, because it can not find _gaq object.
i think jekyll does not include google analytics tracking code when it's running in locally

So, i can not verify my code.
Can someone verify? or is there any way to include google analytics in local mode?
or just merge and see if they works?