Add jruby support with jetty

- jruby: https://github.com/jimmidyson/docker-jruby/blob/master/Dockerfile
- jetty: https://github.com/mthenw/docker-jetty-cargo/blob/master/Dockerfile
Add jruby -S, remove unused command
Merge pull request #1 from choodur/jruby

JRuby support
Use rails version 4.0.3
Merge pull request #3 from choodur/rails-4.0.3

Rails 4.0.3