Changes in line #678: if we assume the opts.verso is jQuery object it…

… makes sense to pass it as-is.

See, the call to .html() method only narrows the types of content which can be passed on to the plugin to.. text.
In fact, gotten rid of .html(), we now can pass anything the jQuery .append() method can handle (primarily another jQuery object and not a simple HTML markup). A possibly deep-cloned DOM object WITH events hooked to it? Hmm. It allows us to interact with the verso side.