Enable the django_nose app by default

The django_nose it is very useful, even outside the test
environment. For example, it lets you to easily run test from
manage.py without additional changes to the test packages.

lms/envs/common.py

@@ -758,6 +758,7 @@ INSTALLED_APPS = (
 
     # For testing
     'django.contrib.admin',  # only used in DEBUG mode
+    'django_nose',
     'debug',
 
     # Discussion forums
@@ -816,4 +817,3 @@ def enable_theme(theme_name):
     # avoid collisions with default edX static files
     STATICFILES_DIRS.append((u'themes/%s' % theme_name,
                              theme_root / 'static'))
-

lms/envs/test.py

@@ -39,8 +39,6 @@ WIKI_ENABLED = True
 SOUTH_TESTS_MIGRATE = False   # To disable migrations and use syncdb instead
 
 # Nose Test Runner
-INSTALLED_APPS += ('django_nose',)
-
 TEST_RUNNER = 'django_nose.NoseTestSuiteRunner'
 
 # Local Directories