Rename test settings file

Author: ryankask

runtests.py

@@ -1,6 +1,6 @@
 import os
 import sys
-os.environ['DJANGO_SETTINGS_MODULE'] = 'test-settings'
+os.environ['DJANGO_SETTINGS_MODULE'] = 'test_settings'
 test_dir = os.path.dirname(__file__)
 sys.path.insert(0, test_dir)