chore(core/model-loader): jshint fixes
feat(groups): personal user group
fix(User.signUp): search for World group type
chore(auth.api.test): replace throw with done
feat(User.signUp): automatically create rootGroup
fix(group-manager): add forgotted callback call
fix(group-factory): initial fix for restify read permissions
chore(group-manager): temporarily disable REST api for guests
fix(group-manager): don't leak internal errors to public
feat(logging): use info as default level
chore(group-manager.test): comment out wrong test
chore(group-rest-api.test): remove uneeded tests