STUD-1911, STUD-1932: Publish sections, subsections and units from course outline.

cms/djangoapps/contentstore/tests/test_contentstore.py

cms/djangoapps/contentstore/views/item.py

cms/static/js/models/xblock_info.js

cms/static/js/spec/views/pages/course_outline_spec.js

cms/static/js/views/course_outline.js

cms/static/js/views/modals/course_outline_modals.js

cms/static/js/views/modals/edit_outline_item.js

cms/static/sass/elements/_modal-window.scss

cms/static/sass/elements/_modules.scss

cms/static/sass/views/_container.scss

cms/static/sass/views/_outline.scss

cms/templates/container.html

cms/templates/course_outline.html

cms/templates/js/course-outline-modal.underscore

cms/templates/js/course-outline.underscore

cms/templates/js/due-date-editor.underscore

cms/templates/js/edit-outline-item-modal.underscore

cms/templates/js/grading-editor.underscore

cms/templates/js/publish-editor.underscore

cms/templates/js/release-date-editor.underscore