ruby: update to 2.2.0

Signed-off-by: Takuya ASADA <syuu@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>
ruby-publify: update to Ruby 2.2.0

Update Ruby 2.2.0, also add mailer settings to prevent calling /usr/bin/sendmail.
Signed-off-by: Takuya ASADA <syuu@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>
ruby-rails-example: update to Ruby 2.2.0

Signed-off-by: Takuya ASADA <syuu@cloudius-systems.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>