Update unicorn dependency to version 4.6.0
Update launchy dependency to version 2.2.0
Update rdoc dependency to version 3.12.1
Update net-ssh dependency to version 2.6.5
Update net-ssh-gateway dependency to version 1.2.0
Update net-sftp dependency to version 2.1.1
Update net-scp dependency to version 1.0.6
Update capistrano dependency to version 2.14.2