Add authorization to UI

[ddey2]

Each main page component will call the api to get what role a user has on the current dataset and add this information to the redux store. Each component will look up in the redux store this information and use it to decide what to show the user.

The main question is how do we keep track on which dataset the user is looking at? Is that another entry in the store?

[longshuicy]

pair this with #318