Update Devise to 2.1.3

http://blog.plataformatec.com.br/2013/01/security-announcement-devise-v2-2-3-v2-1-3-v2-0-5-and-v1-5-3-released/
Merge branch 'hotfix/0.0.2.3'
Merge branch 'master' of git://github.com/diaspora/diaspora