SMS confirmation messages should not be displayed in the Inbox

From Rachel:

Hey Ben,

Quick UI note - previously, Simon had done the code so you couldn't see the message sent for confirmation on the platform (since it's a security measure, showing it on the platform defeats the purpose) - on the new UI, it shows up as a sent message so you can see the URL on the platform. 

Cheers,
Rachel

![screen shot 2013-09-02 at 11 14 58 am](https://f.cloud.github.com/assets/1521387/1066289/03542148-13b0-11e3-8225-6aed95790a25.png)