Add erubi for rbx test to fix failed tests.
Add erubi for rbx test to fix failed tests.

jkowens/sinatra,ryanshaw/sinatra,JonMidhir/sinatra,JonMidhir/sinatra,sinatra/sinatra,ryanshaw/sinatra,jkowens/sinatra,sinatra/sinatra,JonMidhir/sinatra,jkowens/sinatra