Fix runtests.py for Django 1.9

Author: vdboor

runtests.py

@@ -27,7 +27,7 @@
  TEMPLATE_LOADERS=(
  'django.template.loaders.app_directories.Loader',
  ),
- TEMPLATE_CONTEXT_PROCESSORS=default_settings.TEMPLATE_CONTEXT_PROCESSORS + (
+ TEMPLATE_CONTEXT_PROCESSORS=tuple(default_settings.TEMPLATE_CONTEXT_PROCESSORS) + (
  'django.core.context_processors.request',
  ),
  TEST_RUNNER='django.test.runner.DiscoverRunner' if django.VERSION >= (1, 7) else 'django.test.simple.DjangoTestSuiteRunner',