travis: pip --upgrade removal
JSONAlchemy: allow `extend` on parser extension

* Allow to extend the content of the parser extensions, like for the
  producer rules.

Signed-off-by: Esteban J. G. Gabancho <esteban.gabancho@cern.ch>
JSONAlchemy: bug fixes
deposit: migrate workflows and fix test

* Migrates existing workflow to new workflow tasks.

* Fixes an issue with a test.

Signed-off-by: Lars Holm Nielsen <lars.holm.nielsen@cern.ch>
Merge pull request #23 from lnielsen-cern/pu-deposit-fix

deposit: migrate workflows and fix test
JSONAlchemy: WIP