Change delete_item to RESTful URL.

cms/djangoapps/auth/authz.py

cms/djangoapps/contentstore/tests/test_contentstore.py

cms/djangoapps/contentstore/tests/test_item.py

cms/djangoapps/contentstore/views/component.py

cms/djangoapps/contentstore/views/item.py

cms/djangoapps/contentstore/views/tabs.py

cms/static/coffee/src/views/module_edit.coffee

cms/static/coffee/src/views/tabs.coffee

cms/static/coffee/src/views/unit.coffee

cms/static/js/base.js

cms/templates/edit-tabs.html

cms/templates/overview.html

cms/templates/unit.html

cms/templates/widgets/units.html

cms/urls.py

common/djangoapps/util/json_request.py

common/lib/xmodule/xmodule/modulestore/loc_mapper_store.py

common/lib/xmodule/xmodule/modulestore/locator.py

common/lib/xmodule/xmodule/modulestore/mongo/draft.py

...xmodule/xmodule/modulestore/tests/test_location_mapper.py