Sketched out a first idea, how I could implement scopes.
Implemented a first version of WhitelistScope - untested.
A first version of BlacklistScope. Untested.
Forgot :unauthorized..
I added some default scopes (i.e. public, private) into the
mongoid-initializer.
Merge remote-tracking branch 'origin' into scopes
Added a rudimentary support in the actors#create view.
Optimized the actors#create view in means of db queries..
...
Tried to save references to scopes into informations => fails with:
undefined method: '__bson_dump__'
I think, I found a solution... Checking it out.
Revert "I think, I found a solution... Checking it out."

This reverts commit 384ad6f775604f30b3721a9d0ead6acf17a56be8.
Public seems to work.. Private doesn't.
I hope to have fixed the visibility methods - needs to be tested though.
Added some more scopes..
Merge branch 'master' of github.com:pse3/SGfM into scopes
Adapted the actor#edit view.
Adapted actor#update.
Added a Scopes-Controller, scope#list (with en translation)
Forgot something.