Update to 3.24
--------------
3.24  2016-01-13
  - Update Apache 2.4 README, flesh out guts of Authz Provider notes.
  - Improve Apache 2.4 README's AuthzProvider documentation
  - Add POD to Apache2_4::AuthCookie
  - Add FAQ to Apache2_4::AuthCookie documenation
  - 2.4: document that PerlAddAuthzProvider is only needed for *custom* Requires directives.
  - 2.4: make authz_handler recognize multiple usernames in the directive like
    mod_authz_user does.
  - add test case for internal authz_handler
  - explicitly require Apache::Test 1.39 so that APACHE2_4 defines are set

(mef)