Oleg Plakhotniuk authored Sep 19, 2014 and Romain Bignon committed Sep 20, 2014

Signed-off-by: Oleg Plakhotniuk <olegus8@gmail.com>

They bring nothing of value (we never use import * anyway) and introduce
a maintenance burden.

The __all__ that I left might not be very useful either but at least
they are not a pain to maintain; they are also used by pyflakes in some
cases.

This makes nosetests optional at least in theory.
Recent nose versions already do the same thing internally.