additional-notifications

Adding the ability to notify additional people based off of the scgitx file

``` bash
 ➲  git reviewrequest
updating additional-notifications to have most recent changes from master

$ git pull origin additional-notifications
From github.com:socialcast/socialcast-git-extensions
 * branch            additional-notifications -> FETCH_HEAD
Already up-to-date.

  1 adding the ability to specify additional reviewers
$ git pull origin master
From github.com:socialcast/socialcast-git-extensions
 * branch            master     -> FETCH_HEAD
Already up-to-date.

$ git push origin HEAD
Everything up-to-date
Notify additional people? (d)esigner, (e)ngineer or (or hit enter to continue): d
Creating pull request for additional-notifications against master in socialcast/socialcast-git-extensions
Pull request created: https://github.com/socialcast/socialcast-git-extensions/pull/63
Message has been posted https://demo.socialcast.com/messages/1299817
```

Notice the `Notify additional people` question.