Creative Commons Licensing for edX

This PR adds Creative Commons Licensing to the Open edX Platform.

Review tickets
T&L https://openedx.atlassian.net/browse/TNL-195
UX https://openedx.atlassian.net/browse/UX-948
Whoa, whoa, what are you doing here? `getModal` should return a modal. It looks like you're trying to change it so that it can return an element inside a modal. That violates the name of the function. Why do you want to do this?