APIUserTest improvement

APIUserTest improvement
Improve unit test of APIList

Improve unit test of APIList
Merge remote-tracking branch 'origin/master' into back-end-working
Improved caching.
Improved, among other things, privacy and detailed_assoc_for_json().
More unit tests

More unit tests
Fix for issue #35
Merge remote-tracking branch 'origin/master' into back-end-working
Added “message” to the returned JSON.