Update rails version to fix security hole

Patch security fix
http://weblog.rubyonrails.org/2013/1/8/Rails-3-2-11-3-1-10-3-0-19-and-2-3-15-have-been-released/

Notice.
Capybara also updated to 2.0, but it needs change codes to follow changes of framework. 
I keep same version of capybara or capybara webkit at this bundle updating.