Rename herringcove.js to hc.js and remove extra line

Hi @arnp. I starting using herring-cove today for a Jekyll blog I'm starting, and I noticed that the footer references `hc.js` when the file's actually called `herringcove.js`. I renamed the file to `hc.js` to maintain consistency (`hc.css` is also defined).

I also removed an unnecessary line of javascript that was preventing the script from being loaded.

Loving the theme so far, thanks for making it!