Add ability to set staff lock from course outline

cms/djangoapps/contentstore/tests/test_utils.py

cms/djangoapps/contentstore/utils.py

cms/djangoapps/contentstore/views/item.py

cms/djangoapps/contentstore/views/tests/test_item.py

cms/static/js/models/xblock_info.js

cms/static/js/spec/models/xblock_info_spec.js

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

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

cms/static/js/views/course_outline.js

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

cms/static/js/views/pages/container_subviews.js

cms/static/js/views/utils/xblock_utils.js

cms/static/js/views/xblock_outline.js

cms/static/sass/elements/_forms.scss

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

cms/static/sass/views/_container.scss

cms/templates/js/course-outline.underscore

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

cms/templates/js/publish-xblock.underscore

common/test/acceptance/pages/lms/courseware.py