fixed unexpected keywords

Prevent django-nose failing on Django-1.7 with REUSE_DB=1 variable set.

The part of backtrace:

     File "/Users/alex/Projects/tipsi_django1.7/dj1.7/lib/python2.7/site-packages/django/test/runner.py", line 109, in setup_databases
    return setup_databases(self.verbosity, self.interactive, **kwargs)
     File "/Users/alex/Projects/tipsi_django1.7/dj1.7/lib/python2.7/site-packages/django/test/runner.py", line 299, in setup_databases
    serialize=connection.settings_dict.get("TEST_SERIALIZE", True),
   TypeError: _skip_create_test_db() got an unexpected keyword argument 'serialize'