Add plugin to describe tests

This may be out of scope for django-nose. But, I can't live without this plugin and hate the default way that tests are described.

With the plugin, you can add

    NOSE_PLUGINS = [
        'django_nose.plugin.PrintRightPlugin',
    ]
    NOSE_ARGS = ['--with-printright']

and get test printed out like

    test_models:FoobarTestCase.test_something ... ok

which you can just copy paste to run instead of having to disinterpolate, for instance:

    test_something (test_models.FoobarTestCase)