Made meme preview image a link to the meme URL.

Whenever I finish building a meme, for whatever reason, my mind wants to copy the meme URL from the browser address bar. And I *routinely* copy and share the URL to the [builder](http://upboat.me/Builder/cpf/shared%20url%20to%20builder/instead%20of%20real%20url.jpg) page instead of the URL to the [actual meme](http://upboat.me/tmimitw/I-don't-always-copy-URLs/but-when-I-do,-I-copy-them-from-the-address-bar.jpg). (And I **know** I'm not the only one! :wink: )

Providing a clickable link to the meme image makes it easier to send the browser to the meme URL. The preview image seemed an obvious, though inconspicuous, choice.

Subtle, but (for me at least) very helpful.

Thoughts?