Adds a permission 'view wiki edits' so that wiki history can be hidden to certain users (#1154).

A migration automatically adds this permission to roles that were allowed to view wiki pages.

git-svn-id: http://redmine.rubyforge.org/svn/trunk@1815 e93f8b46-1217-0410-a6f0-8f06a7374b81

db/migrate/097_add_wiew_wiki_edits_permission.rb

@@ -0,0 +1,13 @@
+class AddWiewWikiEditsPermission < ActiveRecord::Migration
+  def self.up
+	Role.find(:all).each do |r|
+	  r.add_permission!(:view_wiki_edits) if r.has_permission?(:view_wiki_pages)
+  	end
+  end
+
+  def self.down
+	Role.find(:all).each do |r|
+	  r.remove_permission!(:view_wiki_edits)
+  	end
+  end
+end