update to changelog

CHANGELOG.rst

cms/djangoapps/auth/authz.py

cms/djangoapps/auth/tests/test_authz.py

cms/djangoapps/contentstore/tests/test_contentstore.py

cms/djangoapps/contentstore/views/course.py

cms/envs/acceptance.py

cms/envs/test.py

cms/static/coffee/spec/views/feedback_spec.coffee

cms/static/js/views/feedback.js

cms/templates/emails/activation_email_subject.txt

common/djangoapps/student/forms.py

common/djangoapps/student/tests/tests.py

common/djangoapps/student/views.py

common/lib/capa/capa/capa_problem.py

common/lib/capa/capa/inputtypes.py

common/lib/capa/capa/safe_exec/safe_exec.py

common/lib/capa/capa/tests/test_inputtypes.py

common/lib/capa/capa/tests/test_responsetypes.py

common/lib/xmodule/xmodule/capa_module.py

common/lib/xmodule/xmodule/combined_open_ended_module.py