Added some working controllers and views for the new admin backpage.  Includes trees and users

I've decided to create my own admin backpage.  Why?  The current admin
backpage gives a direct view of how the tables work which might be
confusing to the end-user.  Making our own gives allows us to give them
exactly what they want and doesn't give them too much power to shoot
themselves in the foot.
All admin pages will now verify your admin status before letting you in