Show popup instead on redirecting to noAccess page

This really annoys to get redirected just to read that you don't have access to some resource. Fauxton could provide more nicer popup message that user has no permission to access to some resource and keep him on the place where he currently is. If he comes by direct URL to such resource - yes, redirection to noAccess page is reasonable.

NOTE FROM DEVS:

If you have a backbone history, show a back button so you can return to your previous page.

If you sign in, have it take to the page you had no access to, instead of _all_docs

NO POPUPS.