Adding AuthorizePage & AuthorizeFolder without requiring a policy

[Eilon]

From @hishamco on September 16, 2016 0:17

@rynowak It will be nice if we have an overload to authorize a page or a folder without requiring a policy to be supplied, perhaps I wanna use a simple cookie authentication that will handle the authentication process.
This is an equivalent to using AuthorizeAttribute in MVC controller or an action

Copied from original issue: aspnet/RazorPages#45

[pranavkm]

Makes sense. The policy attribute allows null-or-empty, we just need an extra pair of overloads for this.

[hishamco]

I think I should push my old PR https://github.com/aspnet/RazorPages/pull/48 to the MVC repo

[pranavkm]

@hishamco, sure that sounds like a good idea.

[hishamco]

While the old code has been changed!! for example removing ConstructableAuthorizationFilter, so I updated the PR little bit base on latest update in this repo

[Eilon]

@hishamco thanks for the PR!

@pranavkm please continue to work with @hishamco on #5942 and close this bug when done.

[pranavkm]

Thanks for the PR. Fixed in e44d875