Communities compatibility

[marcustyphoon]

I don't currently have write access to any communities, so I don't know if anything related to adding post action buttons to posts you can edit breaks, but from a quick look at the public one, the only thing I noticed is:

• Communities posts have "authorBlog" separate from "blog", and "blog" is the community itself (e.g. name: "@@communities-feedback"). In the case where we care about the actual author of a post, we'll have to handle this. See: Missing functionality on posts in Tumblr Communities #1441.

Will update if I notice/find out more.