ipython/ipython — pull request #5971 by takluyver (2014-06-10 19:31:33+00:00)
Title: Allow tests to run without jsonschema

- Moved strip_ansi to utils.text, so that the test machinery can load it without loading nbformat
- Added jsonschema as a requirement for the nbformat, nbconvert and html tests
- Skipped some other tests that handle notebooks if nbformat is not importable.

See #5970.