add a 'can_execute_unsafe_code' callback method (ala LMS) to allow for whitelisting of courses with respect to codejailing
add a unit test to exercise the preview_component AJAX callback in the CMS
add test for customresponse problem type
change settings to add test course to sandbox whitelist to try to increase diff code coverage
try to add some additional diff coverage which should get us to 100%
do some lamda magic to refactor out the whitelist checking code to be shared between LMS and CMS
remove incorrect comment
add docstring to newly refactored method
actually, I think we use single quotes for docstrings
actually, seems like we should be using double quotes for docstrings
add another unit test to explicitly exercise the can_execute_unsafe_code() method
remove extra line space at end of file
remove redundent test until we get clarity as to if unit tests are actually using the codejail functionality or not