Merge pull request #199 from edx/db/notifications-refactor

cms/envs/common.py

cms/static/coffee/files.json

cms/static/coffee/spec/models/feedback_spec.coffee

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

cms/static/coffee/src/main.coffee

cms/static/js/models/feedback.js

cms/static/js/models/section.js

cms/static/js/views/feedback.js

cms/static/js/views/section.js

cms/templates/base.html

common/static/js/vendor/underscore.string.min.js