Nbrmd

- Python file format updated to 1.1: default end of cell for python scripts is
one blank space. Two blank spaces are allowed as well. Now you can reformat
code in Python IDE without breaking notebook cells (38).
- Added support for plain markdown files (40, 44).
- Demonstration notebooks more user friendly (45).
- Command line tool simpler to use (46).
- Start code patterns present in Jupyter cells are escaped.
- Default `nbrmd_format` is empty (mwouts/nbsrc/5): no Jupyter notebook
is created on disk when the user opens a Python or R file and saves it from
Jupyter, unless the users asks for it by setting `nbrmd_format`.

**BugFixes**

- Fixed message in the `nbsrc` script (43)
- Technical metadata don't appear any more in scripts unless required (42)
- Code cells that are fully commented remain code cells after round trip (41)

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**Improvements**

- Cell parsing and exporting done in two specialized classes. This is way

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**Improvements**

- R to Rmd conversion compares well to knitr::spin (26)
- Increased coverage to 98%

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**BugFixes**

- Read and write version to the same metadata (36)

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**Improvements**

- Classical jupyter extensions (autoreload, rmagics) are also escaped (35)
- Explicit file format version, set at 1.0, to avoid overriding ipynb
files by accident (36)

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**BugFixes**

- Source only notebooks can be trusted.