WIP - Studio: Group Access Level UI

UX support for statically standing up and styling new UI within containers/components to support group access levels.

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**Background**
* JIRA Story/Spec - https://openedx.atlassian.net/browse/TNL-652
* UI Design - http://invis.io/K21UDOV7H

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**Screenshot - Combined Modal UI**
![screenshot-localhost 8001 2014-12-09 19-23-58](https://cloud.githubusercontent.com/assets/163763/5368828/19dafe78-7fd9-11e4-970a-38dfc73a4bfc.png)

**Screenshot - Container/Unit View Tweaks**
![screenshot-localhost 8001 2014-12-09 19-24-36](https://cloud.githubusercontent.com/assets/163763/5368831/1f777e1a-7fd9-11e4-9a01-2fee6a92a9e4.png)
I think something reusable would be nice. Modals are fairly common in our interface so standardizing them might be nice. Not sure if that's something that we kinda do now, or later.