3 more Access Control calls are RESTful (#749).

{{{
GET /accesscontrol/object/{id}/creator
GET /accesscontrol/object/{id}/owner
GET /accesscontrol/object/{id}/modifier
}}}

Returns a topic's/association's creator, owner, modifier respectively.

BREAKING CHANGE

Access Control API

3 getter methods have changed signatures. Instead of an object they take a sole object ID.
{{{
String getCreator(DeepaMehtaObject object)  -> String getCreator(long objectId)
String getOwner(DeepaMehtaObject object)    -> String getOwner(long objectId)
String getModifier(DeepaMehtaObject object) -> String getModifier(long objectId)
}}}

See #749.