ipython/nbviewer — pull request #135 by minrk (2013-12-03 21:42:21+00:00)
Title: use 'slow page' template when notebooks are slow

original request will finish, it will just never write to the client, only the cache.

should avoid heroku timeout errors

Built on #134, but doesn't actually depend on it, so I can rebase if we want to merge this first.