general: stack

* coveralls
* travis
* sphinx
* tox
* pytest

EDIT: changed to pytest

Signed-off-by: Mateusz Susik <mateusz.susik@cern.ch>
It is an interesting point. Usually license files don't contain dot at the end of copyright line. 
For example: http://opensource.org/licenses/BSD-3-Clause
http://www.lodesys.com/swmanual/licenses/bsd-license.php

There are some exceptions, though. Check: https://github.com/inveniosoftware/workflow/blob/master/LICENSE

```
Copyright (C) 2011, 2012, 2014 CERN.
```

This opens up another question: How to include multiple years in this line?
Which one is better?

``` 2014-2016``` or
```2014, 2015, 2016```

In the first case we can use the comma. 

About the inconsistency: Can you show me some projects that put license into `.rst` files?