Integrate Google+ comments onto blog posts

Found a tutorial online that said to just add the following (have not tested):

``` javascript

gapi.comments.render('comments', {
href: window.location,
width: '624',
first_party_property: 'BLOGGER',
view_type: 'FILTERED_POSTMOD'
});

```

The issue only provides an untested JavaScript snippet and does not name a file or test. Start by locating the Jekyll template used for blog posts, verify whether the Google+ comments service is still available, and test the result on a rendered post; done means comments appear on blog posts without breaking the page.

Written by the indexing model from the issue text.