Up default cache to 1 day. Add semver and checksum immutable file check.
Up default cache to 1 day.
Add semver and checksum immutable file check.

indirectlylit/kolibri,learningequality/kolibri,learningequality/kolibri,learningequality/kolibri,indirectlylit/kolibri,indirectlylit/kolibri,indirectlylit/kolibri,learningequality/kolibri