Added missing import statement

common/djangoapps/terrain/steps.py

@@ -2,7 +2,7 @@ from lettuce import world, step
 from .course_helpers import *
 from .ui_helpers import *
 from lettuce.django import django_url
-from nose.tools import assert_equals
+from nose.tools import assert_equals, assert_in
 import time
 
 from logging import getLogger