view script/generate @ 1087:74407a04925c issue_540

* (publication.rb) - fixed the acts_as_activity query (see diff to previous commit) - not returning duplicate results any longer; added the visible scope to the publication model;
* (init.rb) - created a new public permission - view_publication.

#!/usr/bin/env ruby
require File.expand_path('../../config/boot',  __FILE__)
require 'commands/generate'