Confirmaton on send, banner when 'unverified'

Not yet using the new APIs, but ready to. Still to do:
- Send sync messages on trust decisions
- Respond to received trust decision sync messages
- Show trust decisions in the conversation history
- In that rare situation where a sent message ends up with a key error
  make it easy to retry the send.

FREEBIE

js/views/key_verification_view.js

@@ -75,7 +75,6 @@
             var yourSafetyNumberWith = i18n(
                 'yourSafetyNumberWith', this.model.getTitle()
             );
-            console.log('this.model',this.model);
             var verifyButton = this.model.isVerified() ? i18n('markAsNotVerified') : i18n('verify');
 
             return {