Hbs cloudinary helper

The current HBS template cloudinaryUrl helper doesn't allow for all of the Cloudinary image transformation options to be used. So, this modification to the function adds the cloudinary npm package and passes the full set of options given to the helper to cloudinary.url.

E.g. to call the function with differing crop values as supported by Cloudinary:

```{{{cloudinaryUrl image width=640 height=480 crop='fill' gravity='north'}}}```