On my end, in a clean sandbox, I had to run this before I could run the tests, I'm a cabal / haskell noob so that might not be the best way to do so but :)
Use EditorConfig to define a some basic styling rules for code. This
should also help to reduce the number of commits introducing trailing
whitespace.
See http://editorconfig.org/ for details.
* Text.Pandoc.Writers.Shared contains shared functions used
only in writers.
* metaToJSON now takes a WriterOptions parameter, and will
return an empty object if standalone is not specified.