ADded SmallCaps to Arbitrary instance.
Added Cite to Arbitrary instance.

See #1269.  This reveals some test failures.
Require pandoc-types 1.12.3.3.

Fixes #1269.
gitignore: Ignore cabal's sandbox files
ConTeXt writer:  Improved autolinks.

Closes #1270.
RST reader:  Better handling of directives.

* We now correctly handle field lists that are indented more than
  3 spaces.
* We treat an "aafig" directive as a code block with attributes,
  so it can be processed in a filter.  (Closes #1212.)
RST reader:  Some fixes to last change, and use "author" not "authors".

(in metadata)
Use \setkeys{Gin}{} to set appropriate defaults for \includegraphics.

In pandoc and beamer templates. Thanks to Yihui Xie.
Updated tests for new LaTeX template.
Org reader: Add support for custom link types

Org allows users to define their own custom link types.  E.g., in a
document with a lot of links to Wikipedia articles, one can define a
custom wikipedia link-type via

    #+LINK: wp https://en.wikipedia.org/wiki/

This allows to write [[wp:Org_mode][Org-mode]] instead of the
equivallent [[https://en.wikipedia.org/wiki/Org_mode][Org-mode]].
Merge pull request #1272 from tarleb/link-types

Org reader: add support for custom link types
Markdown reader:  Make one-column pipe tables work.

Closes #1218.