Commits on Jun 25, 2019

1. Add pandoc support …

   Here I try to fix an another warning from tests.
   ```
   cannot load such file -- pandoc-ruby: skipping markdown tests with
   Tilt::PandocTemplate
   ```
   
   `pandoc-ruby` is not defined in Gemfile, so I add it there.
   This gem has a prerequisite dependency `pandoc` application that can be
   installed via homebrew. That's why I update travis.yml to make it
   available during a test run.
   
   The final step to make it work is to exclude `outvar` from the option's
   list provided to the template. When `pandoc` application is called
   with unsupported parameters it stops the execution and returns an
   error.

   

   304 committed Jun 25, 2019
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   c174325 View commit details

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2. Rename default_outvar to exclude_outvar

   

   304 committed Jun 25, 2019
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   6ebf9ce View commit details

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