Cleaning up the golang statsd example

I changed the comments to respect [godoc's comment convention](http://blog.golang.org/godoc-documenting-go-code) (to make it possible to auto generate go documentation from the given source file).

I ran [gofmt](http://blog.golang.org/go-fmt-your-code) on the code which auto-formats the code to be compliant with go standards. 

I also added the golang example to the list of statsd examples in the readme.