Wrap gallery item in one link

![media-icons](https://f.cloud.github.com/assets/74132/2075098/b1853194-8d86-11e3-83f8-c9774ef59078.jpg)

Upshot is it's consistent with how the other items work

Downside is the link is underlined when user hovers over the launch-gallery-in-page icon. UX fail. Though there are a few fails around here (play icon doesn't have the same interaction), and only effects mouse users, i.e. desktop.