Giphy HTML5 and URL Support

Hey Steve - adding in v1 Giphy support for HTML5 and Giphy urls.
going by total instinct here, but I think this line might cause a problem on comments pages in a comment where there are multiple videos, for example... the .entry class is applied to each comment... can you double check / confirm?

possible courses of action:

- only perform this when RESUtils.pageType() === 'linklist'

- actually check some info about the expando before you remove it