Jupytext

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**Added**

- `.py` format for notebooks is lighter and pep8 compliant

**Fixed**

- Default nbrmd config not added to notebooks ([17](https://github.com/mwouts/jupytext/issues/17))
- `nbrmd_formats` becomes a configurable traits ([16](https://github.com/mwouts/jupytext/issues/16))
- Removed `nbrmd_sourceonly_format` metadata. Source notebook is current notebook when not `.ipynb`, otherwise the first notebook format in `nbrmd_formats` (not `.ipynb`) that is found on disk

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**Added**

- Introducing support for notebooks as python `.py` or R scripts `.R`

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**Added**

- Introduced `nbrmd_sourceonly_format` metadata
- Inputs are loaded from `.Rmd` file when a matching `.ipynb` file is opened.

**Fixed**

- Trusted notebooks remain trusted ([12](https://github.com/mwouts/jupytext/issues/12))

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**Added**

- Outputs of existing `.ipynb` versions are combined with matching inputs of R markdown version, as suggested by grst ([12](https://github.com/mwouts/jupytext/issues/12))

**Fixed**

- Support for unicode text in python 2.7 ([11](https://github.com/mwouts/jupytext/issues/11))

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**Added**

- nbrmd will always open notebooks, even if header of code cells are not terminated. Merge conflicts can thus be solved in Jupyter directly.
- New metadata 'main language' that preserves the notebook language.

**Fixed**

- dependencies included in `setup.py`
- pre_save_hook work with non-empty `notebook_dir` ([9](https://github.com/mwouts/jupytext/issues/9))

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**Added**

- Screenshots in README

**Fixed**

- RMarkdown exporter for nbconvert fixed on non-recent python
- Tests compatible with other revisions of nbformat >= 4.0
- Tests compatible with older pytest versions