Added autologin feature (disabled by default).

To enable this feature, go to administration settings and choose a duration for autologin.
When enabled, a checkbox on the login form lets users activate autologin.

git-svn-id: http://redmine.rubyforge.org/svn/trunk@514 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/setting.rb

@@ -49,7 +49,7 @@ class Setting < ActiveRecord::Base
     end
 
     def self.#{name}?
-      self[:#{name}].to_s == "1"
+      self[:#{name}].to_i > 0
     end
 
     def self.#{name}=(value)