Yasha

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Minor release

- Support JSON formatted variable files.
- Prevent misoverwrition of the variable/extension file by the
rendered template.

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Major release

- Added support for so called inline variables given as part of the
command-line call using -v option. This change breaks backward
compatibility as variable and extension files are now given via
-V and -E, respectively.
- Added --keep-trailing-newline option to load Jinja with
keep-trailing-newline=True.