added the ability to set the sort order for roles

git-svn-id: http://redmine.rubyforge.org/svn/trunk@208 e93f8b46-1217-0410-a6f0-8f06a7374b81

db/migrate/020_add_role_position.rb

@@ -0,0 +1,10 @@
+class AddRolePosition < ActiveRecord::Migration
+  def self.up
+    add_column :roles, :position, :integer, :default => 1, :null => false
+    Role.find(:all).each_with_index {|role, i| role.update_attribute(:position, i+1)}
+  end
+
+  def self.down
+    remove_column :roles, :position
+  end
+end