Added initial support for photo posts, which can be added via the
Writer module and will be rendered as a lightbox in the Post module. Post module now also sends webmentions when a post is removed. Removed code that was used to publish to Facebook, as that can no longer be done via brid.dy. Control bar now has either static or sticky positioning, as neither of these values obscure the rest of the page. SimplePie Parser bug fix, an extra array was being added to the Media RSS format which wasn't required.
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