ipython/ipython — pull request #6778 by minrk (2014-10-22 23:40:30+00:00)
Title: [WIP] backport nbformat v4 to 2.x

Check out nbformat v4 for 2.x

still to do:

- [ ] basic tests for opening a v4 notebook
- [ ] keep up to date with v4 API, if it changes