Rest adapt to new savon

@emuzis @Simbul 
So the new incompatibility with Savon was the name of the Message based on the operation. As you can see in the comparison image.
![screen shot 2014-10-01 at 11 11 22](https://cloud.githubusercontent.com/assets/341288/4473477/52575b96-4953-11e4-8a99-8f23e53b647f.png)
So this PR sends the operation name for the message together with the action name, so the message name is not automatically picked from the action name, but instead explicitly set.
Who is your QA?