[#1048] Remove chevah_module_segments.

Problem description
===================

chevah_module_segments is no longer used.

In the same time it is not working with with latest changes in the way chevah namespace package is distributed.


Changes description
===================

Just remove the code and test.

The brink version was updated and there is now a "github" paver command.


How to try and test the changes
===============================

There is nothing spectacular here.