general: stack

* coveralls
* travis
* sphinx
* tox
* pytest

EDIT: changed to pytest

Signed-off-by: Mateusz Susik <mateusz.susik@cern.ch>
- :+1: for listing explicitly each year, the advantage is what @lovasko already mentioned, plus intelligent editors can amend years automatically;

- please use the term "Revised BSD License" for consistency with our other projects;

- the licence text must include sentence "In applying this license, CERN does not waive the privileges and immunities granted to it by virtue of its status as an Intergovernmental Organization or submit itself to any jurisdiction." -- see https://github.com/inveniosoftware/flask-sso/blob/master/LICENSE for live example;

- Have you checked with the management whether the use of BSD is OK in this case, instead of using default GPL?  As mentioned higher, the rule of thumb is, for small libraries BSD is OK, for big products GPL is recommended.  It is possible that Beard is somewhere in the middle, I guess? See [instructions](https://cds.cern.ch/record/1482206/files/OSL-2012-01-Open%20Source%20Licences%20at%20CERN-Short%20version.pdf).