ipython/nbviewer — pull request #274 by minrk (2014-05-06 03:11:45+00:00)
Title: fix word matches in transform_ipynb_uri

`\w` is never the right pattern, use `[\w-]`. It's possible that it should be even more liberal.

Also add a redirect for GitHub tree urls, and fixes the OrderedDict that wasn't actually ordered because it was created from a regular un-ordered dict.