ruby-rails-example: update to 4.1.7

Signed-off-by: Takuya ASADA <syuu@cloudius-systems.com>
Signed-off-by: Nadav Har'El <nyh@cloudius-systems.com>
tomcat: update to 8.0.15

Signed-off-by: Takuya ASADA <syuu@cloudius-systems.com>
Signed-off-by: Nadav Har'El <nyh@cloudius-systems.com>