Do not test against rbx-19mode for now

We aren't really sure if Rails even work on rbx-19mode, as it's on rapid developemnt. We should disble that for now.

.travis.yml

@@ -3,7 +3,6 @@ rvm:
   - 1.9.2
   - 1.9.2
   - ree
   - ree
   - rbx-18mode
   - rbx-18mode
-  - rbx-19mode
 
 
 before_script: "sudo ntpdate -ub ntp.ubuntu.com pool.ntp.org; true"
 before_script: "sudo ntpdate -ub ntp.ubuntu.com pool.ntp.org; true"
 script: "bundle exec rake clean test cucumber"
 script: "bundle exec rake clean test cucumber"