Merge pull request #5774 from edx/cdodge/shopping-cart-touchups

...est/acceptance/tests/lms/test_lms_instructor_dashboard.py

lms/djangoapps/instructor/tests/test_api.py

lms/djangoapps/instructor/tests/test_ecommerce.py

lms/djangoapps/instructor/views/api.py

lms/djangoapps/instructor/views/api_urls.py

lms/djangoapps/instructor/views/instructor_dashboard.py

lms/djangoapps/instructor_analytics/basic.py

lms/djangoapps/instructor_analytics/tests/test_basic.py

lms/djangoapps/shoppingcart/exceptions.py

lms/djangoapps/shoppingcart/models.py

lms/djangoapps/shoppingcart/tests/test_views.py

lms/djangoapps/shoppingcart/views.py

lms/static/coffee/src/instructor_dashboard/e-commerce.coffee

lms/static/sass/course/instructor/_instructor_2.scss

lms/static/sass/views/_shoppingcart.scss

...mplates/instructor/instructor_dashboard_2/e-commerce.html

lms/templates/shoppingcart/billing_details.html

lms/templates/shoppingcart/receipt.html

lms/templates/shoppingcart/shopping_cart.html