Admin first draft

This pull request includes the following:

- Segregates the CSS and JavaScript for the guardian and admin sides of the application. 
- Updates to the model by unifying the admin objects into `AdminUser`
- Provides some dummy routes for admin (this will be replaced shortly)

@codesliced @markGiansanti Ready for review. Please leave this branch open after merging as @andrewmaier will continue using it for preparing the admin screens.