Merge remote-tracking branch 'origin/webkit-mem-testing' into webkit-mem-testing
add models.Hiddenshot as subClass of models.Photo

* insert .hiddenshot directly into .shot-wrap
* update renderBody() to NOT append .hiddenshot

* http://github/backbone-playground/?backend=cake&type=owner&perpage=100&sort=dateTaken&hidden=1
add CSS .thumb.focus