 **Update:** We've written a complementary post that goes into more depth. Read this first and then check out [Rails in Realtime, Part 2](http://layervault.tumblr.com/post/31462727280/rails-in-realtime-part-2). [LayerVault](http://layervault.com) is built using the popular web framework, Ruby on Rails. The framework, at times known for its d
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