GPII-515: added better configurability for the CORS middleware.
GPII-515: updated comments.
Merge branch 'GPII-515'

* GPII-515:
  GPII-515: updated comments.
  GPII-515: added better configurability for the CORS middleware.
  GPII-115: updated to a version of infusion that fixes the issues with grade linkage.