Replaces the old Prototype based Lightbox with a more modern based on Bootstrap and Jquery.
Fixes bootstrap use in the image gallery.
Porting the lightbox plugin to the new version.

BTW, lightbox.js was called, but did not embed Prototype, so I'm wondering how it worked.
Removing useless Javascript.

Prototype is not required anymore as we've moved Lightbox to Jquery. And I also feel prototype_ext would not have worked without Prototype
Fixes the specs
Merge pull request #477 from publify/bug/fix-lightbox

Moves Lightbox to Jquery / Bootstrap