Admin and ambassador dashboard

Basic view for the admin and ambassador dashboard. Added a review page, and views for proposed and edited projects.

As of right now, it is incomplete, and does no user verification. Also, the review page is the same for both ambassadors and admins.

Note, the review page might not have been implemented in the best way, let me know any comments on how to implement this better.
I think it would make more sense to have these functions be methods of the Project rather than the ProjectManager (like `project.mark_approved()` rather than `Project.objects.approve_project(project)`). What do you think?