1.7: blessings uses nose

[kloczek]

Looks like blessings is one of the last few modules which is still using nose which should not be used with python 3.x https://nose.readthedocs.io/en/latest/
Any plans to migrate to pytest or even unittest? (better would be pytest)

[tkloczko@ss-desktop blessings-1.7]$ grep -r nose
blessings/tests.py:from nose import SkipTest
blessings/tests.py:from nose.tools import eq_
blessings/__init__.py:            # work even when -s is passed to nosetests. Lean toward sending
blessings/__init__.py:            # running simply `nosetests` (without progressive) on nose-
.travis.yml:  - pip install -q nose
.travis.yml:  - nosetests -w /tmp blessings.tests
setup.py:    tests_require=['nose'],
setup.py:    test_suite='nose.collector',
tox.ini:commands = nosetests blessings
tox.ini:    nose
README.rst:  * Extracted Blessings from nose-progressive, my `progress-bar-having,
README.rst:.. _`progress-bar-having, traceback-shortcutting, rootin', tootin' testrunner`: http://pypi.python.org/pypi/nose-progressive/

[TheChymera]

@kloczek Here's a PR for this, doesn't quite work yet, help welcome:

#165