* Add programs endpoint & programs list to summaries

* Exclude programs array from the course_summaries

* Add/fix tests, program field exclude option

* Refactor common list view code into APIListView

* Fix some pylint errors

* Fix bad import

* Use assertListEqual and sort lists first

* Refactor common test code into mixin

* Increase test coverage (test add_programs)

* Add documentation for programs query arg

* Address PR comments