Movies: Change images that end in png, too.

If you look at https://duckduckgo.com/?q=movies now, you'll see that the Transformers poster is blurred.

![screen shot 2014-06-30 at 6 44 46 am](https://cloud.githubusercontent.com/assets/81969/3428678/465690f8-0044-11e4-9c9f-a2713cf364ff.png)

That's because the image extension is png, and it has parameters so the regexp wasn't matching it.
@russellholt Merge this in?