Nbrmd

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**BugFixes**

- Indented python code will not start a new cell 20
- Fixed parsing of Rmd cell metadata 21

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**Improvements**

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

**BugFixes**

- Default nbrmd config not added to notebooks (17)
- `nbrmd_formats` becomes a configurable traits (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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**Improvements**

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

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**Improvements**

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

**BugFixes**

- Trusted notebooks remain trusted (12)

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**Improvements**

- Outputs of existing `.ipynb` versions are combined with matching inputs
of R markdown version, as suggested by grst (12)

**BugFixes**

- Support for unicode text in python 2.7 (11)

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**Improvements**

- 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.

**BugFixes**

- dependencies included in `setup.py`
- pre_save_hook work with non-empty `notebook_dir` (9)